Every DJ term, with a number behind it.

BPM

BPM — beats per minute — counts how many beats land in sixty seconds. It is the first number a DJ checks, because two tracks have to agree on tempo before anything else about them matters.

128 BPM is the busiest shelf in the catalog with 36,548 tracks stored there, and 251,359 of 457,965 tracks with a detected tempo (54.9%) sit between 120 and 130.

Bar

A bar is four beats in 4/4 time — one full cycle of the kick pattern. DJs count in bars rather than seconds because a bar is the same length of music at any tempo, and seconds are not.

At 128 BPM — the catalog's busiest tempo, 36,548 tracks — one bar lasts 1.88 seconds, so the median track at 5:48 runs about 186 bars.

Phrase

A phrase is a block of bars a track is built from, usually 8, 16 or 32. Electronic music changes at phrase boundaries, so a mix that starts on one keeps both tracks structurally in step.

251,359 of 457,965 tracks with a detected tempo (54.9%) sit between 120 and 130 BPM, where a 32-bar phrase runs 59.1 to 64.0 seconds.

Half-time

Half-time is a groove that feels half as fast as it counts — the snare lands every other bar instead of every other beat. Drum & bass written at 174 BPM is felt, and often detected, at 87.

46,690 of 443,307 tracks with a detected tempo (10.5%) are stored below 95 BPM, and 81.9% of drum & bass is among them.

Double-time

Double-time is the mirror of half-time: a groove counted at one tempo and felt at twice the rate. A 70 BPM beat played as 140 is the same record, counted differently, and mixes on the same grid.

The octave is lopsided in both directions: 70 BPM holds 2,945 tracks against 18,538 at 140, while 87 holds 11,352 against 173 at 174.

Four-on-the-floor

Four-on-the-floor is a kick drum on every beat of the bar. It is the rhythmic base of house, techno and trance, and it is the reason those genres mix into each other so easily.

273,725 of 443,460 public tracks (61.7%) are tagged into the house, techno and trance family built on it, at a median of 126 BPM.

Beatmatching

Beatmatching is lining up two tracks so their beats land together — matching the tempo, then nudging the phase until the kicks coincide. It is the base skill every other mixing technique sits on top of.

The median tempo gap DJs actually mix across here is 1.0 BPM, and 81.5% of 7,243 hand-sequenced transitions land within 3.

Pitch fader

The pitch fader is the slider that speeds a track up or slows it down, usually by up to 6 or 8 percent. It is how two records are brought to the same tempo before they are mixed.

A ±6% pitch fader reaches furthest from 127 BPM, where it covers 274,840 of 457,965 tracks with a detected tempo (60.0%) — more than it reaches from 128, the tempo the catalog actually stocks most.

Beatgrid

A beatgrid is the map your DJ software lays over a track marking where every beat falls. Once it is right, sync, looping and quantise all work; once it is wrong, everything built on top of it is wrong too.

Our analyser reads 443,442 of 443,460 public tracks as 4/4 — and still flags its own tempo reading as uncertain on 71,506 of them, one track in six.

Tempo bridge

A tempo bridge is a track played to move a set from one tempo neighbourhood to another — fast enough to follow what came before, slow enough to lead into what comes next, so the change never happens in one jump.

Between the house shelf at 128 BPM and the 140 where psy-trance and dubstep sit, the catalog holds 45,148 tracks at 132–138 BPM — 9.9% of everything with a detected tempo.

Beat

A beat is the steady pulse you tap your foot to — the unit tempo is counted in. Four of them make a bar in the 4/4 time nearly all dance music is written in.

At 128 BPM — the catalog's busiest tempo, 36,548 tracks — a beat lasts 0.47 seconds, so a bar is 1.88 and a 32-bar phrase is 60.0.

Downbeat

The downbeat is the first beat of a bar — the "one" a DJ counts to. It is where the kick lands hardest and where every phrase, drop and transition is aligned from.

100.0% of the catalog — 443,442 of 443,460 public tracks — reads as 4/4, which is what makes one correct downbeat imply the whole grid.

Time signature

A time signature says how many beats are in a bar and which note value counts as a beat. Dance music is almost entirely 4/4 — four quarter-note beats to the bar, every bar.

443,442 of 443,460 public tracks read as 4/4 — 100.0% — leaving 18 in the whole catalog that do not.

Swing

Swing delays every second sixteenth note so the rhythm lopes instead of marching. It is the difference between a house record that rolls and one that sits rigidly on the grid.

Our groove reading — swing and rhythmic pull — runs at a median of 71 across 443,242 analysed tracks, and it tracks danceability at 0.47.

Syncopation

Syncopation puts accents where the beat is not — on off-beats and in the gaps between them. It is what makes a groove pull against the pulse rather than restate it.

A syncopated record wants a simple one underneath it — two busy off-beat patterns fight for the same space and turn to mush.

Beat vs bar

A beat is one pulse; a bar is a group of them, four in almost all club music. Tempo is counted in beats and structure in bars, which is why DJs use one for matching and the other for planning.

Beats for speed, bars for structure. Four beats to a bar, and eight or sixteen bars to a phrase.

Half-time vs double-time

Half-time keeps the tempo and moves the drums to half the rate, so the track feels slower without being slower. Double-time does the reverse. Neither changes the BPM — both change what the BPM feels like.

Both are a drum feel at a fixed tempo. That is why 174 and 87 mix, and why detectors read one as the other.

Pitch vs tempo

Tempo is how fast a track plays; pitch is how high it sounds. On a turntable they are one control, because speeding a record up raises its pitch. Digitally they can be separated, which is what key lock does.

Coupled, tempo drags pitch with it. Key lock separates them and charges you artefacts for the privilege.

Triplet

A triplet divides a beat into three instead of two. It is the rhythm behind shuffle, swing-heavy house and most trap hi-hat patterns, and it sits inside a normal 4/4 bar without changing the tempo.

Three notes where two would go. Identical BPM, and a straight record over a triplet one still fights.

Polyrhythm

A polyrhythm runs two conflicting subdivisions at once — three against four is the classic — so the two patterns only line up again after several beats. It creates motion without changing tempo.

Two subdivisions at once, resolving every few beats. It is why minimal techno moves without changing.

Broken beat

A broken beat is any drum pattern that does not put a kick on every beat — the kick moves, the snare displaces, and the groove leans rather than marches. It is the opposite of four-on-the-floor.

No kick on every beat, so there is nothing steady to hide a phrasing error under.

Two-step

Two-step is a broken pattern with kicks on the first and third beats and a snare on the second and fourth, leaving the offbeats open. It is the rhythm UK garage is built on and it swings by design.

Kicks on one and three, snares on two and four, everything interesting in the gaps.

Count-in

Counting in is tracking where you are in the bar and the phrase, out loud or in your head, so you launch the next record on a downbeat rather than wherever the fader happened to move.

Count in fours and track the eights. It is what tells you which beat, when beatmatching only tells you the beat.

Click track

A click track is a steady metronome pulse a performer plays along to so the recording stays at a fixed tempo. Music recorded to one has a constant BPM; music recorded without one drifts.

Programmed music is on a click and grids perfectly. Played music is not, and no fixed grid will ever fit it.

Camelot key

Camelot notation renames every musical key as a number from 1 to 12 plus a letter — A for minor, B for major. 8A is A minor. Codes next to each other on the wheel share most of their notes.

8A is the most crowded code in the catalog at 8.08% of 458,072 tracks with a detected key, and 1B the thinnest at 1.65% — a 4.9× spread across 24 codes.

Harmonic mixing

Harmonic mixing means choosing the next track by key as well as tempo — staying on the same Camelot code, moving one step around the wheel, or swapping between the major and minor of the same number.

70.5% of 7,243 transitions DJs sequenced by hand here are textbook Camelot moves, against 18.3% if the same keys were drawn at random — 3.8× chance.

Open Key

Open Key is a second notation for the same wheel Camelot describes. It numbers the positions differently — C major is 1d rather than 8B — and uses m and d for minor and major, but the mixing rules are identical.

The most crowded position in the catalog is 8A in Camelot — 1m in Open Key, A Minor — with 37,020 of 458,072 tracks that carry a detected key, 8.1% of them.

Relative major and minor

Relative major and minor are two keys built from the same notes — A minor and C major, for instance. On the Camelot wheel they share a number and differ only by letter, which is why moving between them always works.

271,306 of 443,057 analysed tracks are in a minor key — 61.2% — against 171,751 in major, so for most records the relative switch is a move into the light.

Energy boost

The energy boost is the +2 move on the Camelot wheel — two positions clockwise, same letter — which lifts a mix by a whole tone. Every chart lists it as a legal move, and it is the one DJs reach for least.

Across 7,243 transitions sequenced by hand here, the +2 energy boost appears in 2.29% — against 4.79% expected by chance. DJs use it at 0.48× the rate a shuffled running order would.

Tonal shift

A tonal shift moves one position around the Camelot wheel and switches between major and minor at the same time — 8A to 9B, say. No standard chart lists it, and it is the most common rule-break DJs make.

The diagonal appears in 12.1% of 7,243 hand-sequenced transitions against 7.7% by chance — 1.6× — and accounts for 41% of every move that breaks the textbook rules.

Key lock

Key lock — master tempo on a CDJ — holds a track at its original pitch while you change its tempo. Without it, speeding a record up raises its key and quietly undoes whatever harmonic mixing you had planned.

One semitone is a 5.95% tempo change, so a ±6% fader spans almost exactly one — and from 128 BPM that fader reaches 260,587 of 457,965 tracks with a detected tempo.

Musical key

The musical key is the note a track resolves to plus whether it is major or minor — A minor, F major. It is the same information a Camelot code carries, written the way a musician would write it.

10 of the 24 keys have two names — F♯ minor is also G♭ minor — and 31.0% of the 458,072 keyed tracks in our catalog sit in one.

Camelot vs classical key

Camelot relabels the twelve major and twelve minor keys as numbers and letters arranged so neighbours are compatible. Classical notation names the actual key. Both describe the same twenty-four keys.

Camelot for speed under pressure, classical for understanding why. Same twenty-four keys, different labels.

Open key vs Camelot

Open Key and Camelot are two competing relabellings of the same twenty-four keys, both arranged so that neighbouring numbers are compatible. They differ only in where the numbering starts and whether it uses d/m or A/B.

Camelot notation appears on 76.0% of tracks in real DJ libraries. Open Key appears on 0.15%.

Semitone

A semitone is the smallest step in Western music — one fret, one piano key including the black ones. Twelve of them make an octave, and everything a pitch fader does is measured in fractions of one.

Twelve semitones to an octave, and roughly 6% of tempo change to one. That is the tempo-to-key exchange rate.

Octave

An octave is a doubling of frequency — twelve semitones, and the interval at which a note repeats itself with the same name. It is the one interval every listener hears as "the same note, higher".

A doubling. It is why 174 and 87 mix, and why the frequency spectrum is described in octaves rather than hertz.

Chord

A chord is three or more notes sounding together. Which notes they are decides whether a passage reads as major or minor, and the set of chords a track uses is what a key detector is trying to infer.

Two records playing at once are stacking chords. Sparse harmony forgives; busy harmony does not.

Scale

A scale is the ordered set of notes a piece of music draws on. Major and minor are the two that dominate club music, and which one a track uses is half of what its key name tells you.

61.2% of analysed tracks with a detected key are in a minor scale — 271,306 against 171,751 major.

Mode

A mode is a scale started from a different note of the same set — Dorian, Phrygian, Mixolydian and the rest. Major and minor are two of the seven, and the other five turn up more in club music than people expect.

A detector calls every mode major or minor. When a "minor" record sounds unexpectedly bright, this is usually why.

Perfect fifth

A perfect fifth is the interval of seven semitones — the most consonant interval after the octave, and the one the Camelot wheel is built from. Moving one step round the wheel is moving a fifth.

Seven semitones, six shared notes out of seven. Every +1 and −1 on the wheel is this interval.

Circle of fifths

The circle of fifths arranges the twelve keys so that neighbours are a fifth apart and share almost all their notes. The Camelot wheel is this diagram with the keys relabelled as numbers and letters.

Camelot IS the circle of fifths, relabelled. Numbers instead of key names, so the neighbours become +1 and −1.

Tritone

A tritone is six semitones — exactly half an octave, and the most dissonant interval in Western music. Two keys a tritone apart sit opposite each other on the wheel and share the fewest notes.

Six semitones, six positions round the wheel — the maximum-clash move, and the one to check before you commit.

Dissonance

Dissonance is the unsettled sound of notes that do not agree; consonance is the settled sound of notes that do. Neither is a fault — a record with no dissonance anywhere has nothing to resolve.

Dissonance inside a record resolves. Dissonance you create between two records does not — it just sits there.

Root note

The root note is the note a key is built on and the one everything else resolves toward — the A in A minor. In club music it is usually whatever the bassline keeps returning to.

The bassline states the root. That is why two low ends at once is the fastest way to hear a key clash.

Parallel key

A parallel key shares its root note but swaps major for minor: A major and A minor. It is not the same as a relative key, which shares the notes but not the root.

Same root, opposite mode. It is the big colour change — and it is not the relative key, which shares the notes.

Enharmonic

Two notes are enharmonic when they sound identical and are written differently — C sharp and D flat are the same pitch with two names. It is a notation difference, not a musical one.

One pitch, two spellings. It is why a key column can list the same key twice and refuse to sort.

Absolute pitch

Absolute pitch is the ability to name a note without a reference. It is rare, largely fixed by early childhood, and — unlike almost every other musical skill — it is not what DJing actually requires.

You do not need it. Mixing needs relative hearing — do these two agree — and that is trainable at any age.

Drone

A drone is a single note held continuously underneath everything else. It fixes the harmony in place, so anything played over it is heard in relation to that one note.

One note held down. Almost nothing to disagree with, and nowhere to hide when something does.

Energy

Energy is a 0–100 reading of how hard a track hits, taken from loudness, spectral drive and percussive weight. It is the dimension that decides where in a set a track belongs rather than what it mixes with.

The median track in the catalog reads 56 for energy across 443,242 analysed tracks, and the scale is clipped at the top — 100 is a tie, not a rank.

Groove

Groove is a 0–100 reading of swing and rhythmic pull — how much a track moves rather than simply pounds. It is what makes a quiet record danceable and a loud one stiff.

Groove runs high across the catalog — a median of 71 over 443,242 analysed tracks — and it barely tracks energy at all: the correlation between the two is -0.11.

Valence

Valence is a 0–100 reading of musical mood — bright and lifting at the top, dark and tense at the bottom. It is the dimension that decides whether two tracks feel like they belong to the same night.

Valence never reaches either end of its own scale in this catalog: across 443,242 analysed tracks the darkest reads 18 and the brightest 79, with a median of 45.

Danceability

Danceability is a 0–100 reading of how easy a track is to move to — steady tempo, strong beat, regular rhythm. It is not the same as energy: a slow, quiet record can be highly danceable.

Danceability sits high and tight — a median of 73 across 443,242 analysed tracks, spanning only 27 to 96.

Texture

Texture is the tone of a track rather than its rhythm — how bright, how warm, how bass-heavy, how percussive. Two tracks can agree on key and tempo and still clash on texture.

The median track reads 88 for bass weight, 59 for brightness, 44 for percussive ratio and 37 for warmth across 443,242 analysed tracks.

Chemistry

Chemistry is Mixgraph’s score for how well two tracks mix, from six weighted dimensions: harmonic key, tempo, energy, groove, mood and vocals. It rates the pair, not either track on its own.

A chemistry score of 85 or better is rare by construction — 0.0917% of 2,999,426 randomly drawn cross-artist pairs reach it — which is what makes the number worth reading.

Instrumental

An instrumental is a version of a track with the vocal taken out, or a record that never had one. DJs use them to lay an acapella over the top, or to stop a vocal-heavy stretch of a set crowding itself.

Our analyser puts 165,610 of 443,242 tracks above 0.80 on instrumentalness and only 17 below 0.20 — a floor that empty is a fact about the detector, not about how many records have a vocal.

Loudness

Loudness is a track’s average level in decibels below full scale, so every value is negative and closer to zero is louder. It decides how far you move the gain, not how hard the record hits.

Eight tracks in ten sit between -13.32 dB and -8.45 dB — a band 4.9 dB wide around a median of -10.68 — while the catalog as a whole runs from -85.23 to -2.80.

Vocal chop

A vocal chop is a voice cut into short fragments and replayed as a melodic or rhythmic part. It reads as a hook rather than as a lyric, and it is one of the most recognisable sounds in modern dance music.

A vocal chop behaves like a synth line, not a voice: pitched, locked to the grid, and able to clash where a sung phrase would not.

Brightness

Brightness is how much of a record lives up top — hats, air, the shine on a synth — against how much sits underneath. A bright track leads with its top end; a dark one puts the weight low.

Bright leads with hats and air; dark puts the weight underneath. Big jumps between the two are felt, not heard.

Warmth

Warmth is body in the low-mids — the part of a record that makes it feel round rather than thin. It is what people mean when they call a track analogue, and it has nothing to do with the equipment.

Warmth is low-mid body. Two warm records together turn to mud, and the fix is the mid knob, not the bass.

Bass weight

Bass weight is how much of a record’s energy sits down low — how physical it feels rather than how loud it is. A heavy track moves air you feel in your chest; a light one leaves the bottom empty.

Nearly everything in a club record bag is heavy. The light ones are what an opening hour is actually short of.

Percussive ratio

A percussive track is mostly hits — drums, stabs, short sounds — where a sustained one leans on pads and held chords. It is the difference between a record that fills a gap and one that fills the space.

Pair a percussive record with a sustained one and they layer. Pair two sustained ones and they crowd.

Key confidence

Key confidence is a score some software shows next to a detected key, meant to tell you how sure it is. A low score is a flag to check that track by ear before you build a transition on it.

Low confidence means check that one by ear. First, check the score varies at all — plenty of software fills it in blind.

Tempo confidence

Tempo confidence is a detector’s own estimate of how certain it is about the BPM it found. Low confidence usually means the track has an unclear pulse, a tempo change, or a rhythm the detector could read two ways.

Sort a new library by confidence ascending. The bottom of that list is your entire manual gridding job.

Liveness

Liveness describes whether a recording was made in front of an audience — a live set, a concert cut, a room recording. Some software scores it automatically; either way it tells you a track will behave differently.

Live records drift, because people played them. Ride the pitch or keep the blend short — a fixed grid will not hold.

Speechiness

Speechiness estimates how much of a track is talking rather than music — a skit, an intro monologue, a podcast. It is not a vocal detector, and mistaking it for one is a very common waste of an evening.

It finds talking, not singing. If you are hunting vocals with it, it will tell you that you own none.

Acousticness

Acousticness describes how much of a record was played rather than programmed — a piano, a guitar, strings, a voice in a room. In a club catalog it is rare, and the rare ones are unusually useful.

The one record in the bag that sounds like nothing else in it. Worth carrying two or three for exactly that.

Kick

The kick is the low drum that states the beat — in most dance music, on every one of the four beats in a bar. It carries the pulse and most of the energy a floor actually feels.

273,725 public tracks — 61.7% of the catalog — are tagged into the house, techno and trance family built on a four-to-the-floor kick, at a median of 126 BPM.

Snare

The snare is the sharp drum that answers the kick, usually on beats two and four. In dance music it is often a clap or a layered mix of both, and it is what tells you where you are in the bar.

46,690 of 443,307 tracks with a detected tempo — 10.5% — sit below 95 BPM, and most of that is fast music whose snare pattern fooled the detector.

Hi-hat

The hi-hat is the high, ticking percussion that fills the space between kick and snare. Open hats on the off-beat are the sound that makes house music move.

Hats are the safest thing to leave overlapping — the top end is the one range where two records rarely fight.

Bassline

The bassline is the low melodic part that moves underneath the drums. It carries the track’s harmony as much as its weight, which is why two of them at once clash in a way two melodies do not.

Bass weight runs at a median of 88 across 443,242 analysed tracks and is clipped at the top of its scale — this catalog is built almost entirely from bass-led music.

Sub-bass

Sub-bass is the lowest band of a record, roughly below 60 Hz — the part a club feels through the floor rather than hears. It is where most of a track’s physical impact lives.

Sub is nearly inaudible on headphones and enormous on a rig, so it is the one band you cannot mix by ear alone.

Top line

The top line is the main melodic or vocal hook sitting above everything else — the part you hum afterwards. It occupies the upper mids, which is the most crowded space in any mix.

Brightness — how much of a record sits in the upper range where a top line lives — runs at a median of 59 over 443,242 analysed tracks, and is clipped at the top of its scale.

Three-band EQ

A three-band EQ splits each channel into low, mid and high and gives you a knob for each. It is the primary tool for deciding which parts of two records are audible at any moment.

The three bands map onto what our analyser reads: bass weight at a median of 88, warmth at 37 and brightness at 59 across 443,242 tracks.

Kill EQ

A kill EQ removes a band completely when the knob is turned fully down, rather than merely attenuating it. On a mixer with true kills, taking the bass to zero leaves genuinely nothing below the crossover.

A true kill turns the low band into a switch: one record owns the bass or the other does, with nothing in between.

Filter

A filter removes everything above or below a moving cutoff point. A high-pass strips the bottom away as you turn it up; a low-pass takes the top off as you turn it down.

A filter moves a record along the same axis our analyser reads: brightness runs 2 to 100 across 443,242 tracks, at a median of 59.

Gain

Gain sets how hot a track arrives at the channel before anything else touches it. Most club mixers label the same control trim. It is a correction for how a record was mastered, not a volume control for the room.

Set gain so the channel meter peaks in the same place on both decks, then leave it alone and mix with the faders.

Headroom

Headroom is the gap between where your signal is sitting and the point where it distorts. It is the room left for the loud parts, and for whatever you do to the channel next.

Leave headroom for the moment two records are both playing — that is when a mix demands the most and has the least.

Clipping

Clipping is what happens when a signal exceeds the maximum a system can carry: the peaks are cut flat, adding harsh harmonics. In digital audio the ceiling is 0 dBFS and there is nothing above it.

Red on the master is not "loud" — it is the sound breaking, and on a club rig it arrives as pain rather than impact.

dBFS

dBFS means decibels relative to full scale — the digital measurement where 0 is the loudest a file can be and everything else is negative. A track at −10 dBFS sits ten decibels below the ceiling.

Nothing in the catalog reaches the ceiling: the loudest master we hold sits at -2.80 dBFS, the quietest at -85.23, and the median at -10.68 across 443,242 tracks.

Limiter

A limiter is a compressor with an absolute ceiling: it lets everything through until a set level, then refuses to exceed it. Mastering engineers use one on every record you own.

A limiter on a club system is a safety net, not a mixing tool — if it is working hard, fix the gain instead.

Compressor

A compressor reduces the level of anything above a threshold, narrowing the gap between the loud and quiet parts. The result can then be turned up as a whole, which is how records get their density.

Compression is why a club record feels dense without any single moment being especially loud.

Transient

A transient is the short burst of energy at the start of a sound — the click of a kick, the snap of a snare. It is what makes percussion readable and what beat detection listens for.

Percussive ratio — how much of a record is transient rather than sustained — runs at a median of 44 across 443,242 analysed tracks, spanning 3 to 73.

Ducking

Ducking pulls one signal down whenever another plays — almost always everything else dropping on each kick. It is the pumping motion at the heart of most house and trance.

Two heavily ducked records pump against each other unless their kicks are locked — the motion is only pleasant when it agrees.

LUFS

LUFS means loudness units relative to full scale — a loudness measurement weighted to match how ears hear rather than what a peak meter reads. Streaming platforms and DJ software both normalise to a LUFS target.

Records first released before 2000 sit 3.33 dB quieter than the 2020s across our catalog — -13.47 against -10.14 — which is the loudness war, measured.

True peak

True peak is the highest level a waveform actually reaches between the samples that describe it. A file whose every sample sits below the ceiling can still overshoot it once a player reconstructs the sound.

A file can read under the ceiling on every sample and still clip the moment a player turns it back into sound.

Gain normalisation

Gain normalisation sets every track to the same measured loudness automatically, so a quiet record and a loud one arrive at the channel matched. It corrects for mastering, not for how hard a record hits.

Nearly half the transitions DJs build here need under a decibel of gain correction — one in ten needs three decibels or more, and the widest in the corpus is 12.36.

Mono sum and phase

Summing to mono adds the left and right channels together. Anything out of phase between them cancels rather than adding, which is why a wide stereo bass can lose most of its weight on a mono system.

Keep the low end mono: a club rig sums the bottom in the room whether or not your mixer does it first.

Arpeggio

An arpeggio plays the notes of a chord one after another instead of together. In electronic music it usually arrives as a fast repeating pattern from an arpeggiator, running in time with the tempo.

Treat an arp as a lead, not as texture: give it the mix on its own, or filter one back.

Fill

A fill is a short break in the drum pattern — a tom run, a snare roll, a beat left out — marking the end of one section and the start of the next.

Use fills as the boundary marker: when one lands, the next phrase is starting, and that is where a mix belongs.

Stab

A stab is a short, hard chord hit — an organ, a brass sound, a synth chord — cut off almost as soon as it sounds. It carries harmony without occupying space, which is why house music is built on them.

Stabs mix where pads do not, because each hit is over before the other record’s harmony has to agree with it.

Limiter vs compressor

Both reduce dynamic range. A compressor turns down loud signals gradually by a ratio; a limiter stops them passing a ceiling at all. A limiter is a compressor with an extreme ratio and a fast attack.

A limiter protects a ceiling, a compressor shapes a sound. Neither makes a club louder — the system already limits.

Volume

Volume is how much of a signal leaves a stage — the fader. Gain is how much arrives at it. Every beginner conflates them, and the confusion produces a mix that is either quiet or distorted with no way back.

Gain corrects the record, volume mixes the room. Fix a level difference at the top of the strip, never at the fader.

Pad

A pad is a sustained, slow-moving sound — usually a synth or strings — that fills the background and holds the harmony. This is the musical sense; the rubber squares on a controller are performance pads.

Pads sustain, so two of them collide. Cut the mids on one and the pair usually resolves.

Threshold

Threshold is the level above which a compressor or limiter starts working. Below it nothing happens; above it the processor reduces gain by whatever the ratio says.

Threshold decides how often it acts. If everything crosses it, you have simply made the record quieter and flatter.

Ratio

Ratio sets how hard a compressor reduces anything above the threshold. At 4:1, four decibels of input above the threshold become one of output. At 20:1 or beyond it stops being compression and becomes limiting.

Low ratios shape, high ratios limit. Past about 10:1 you have built a limiter, whatever the box is called.

Attack and release

Attack sets how quickly a compressor responds once the signal crosses the threshold; release sets how quickly it stops once the signal falls back. Together they decide whether you hear the processor or the music.

Fast attack kills punch, slow attack keeps it. Release in time with the beat grooves; release out of time breathes.

Multiband compression

Multiband compression splits the signal into frequency bands and compresses each separately, so a loud bassline does not pull the whole track down with it. Club system processors use it; DJ mixers generally do not.

One band per frequency range, so the kick stops dragging the vocals down with it. That is the venue’s processor, not yours.

Peak and VU meters

A peak meter shows the highest instantaneous level, catching transients a fraction of a millisecond long. A VU meter averages over roughly 300 milliseconds, so it shows something much closer to perceived loudness.

Peak catches transients, VU shows loudness. Match records on the averaging meter, never on the peaks.

RMS

RMS is an average of level over a short window rather than an instant reading. It tracks how loud something actually sounds far better than a peak meter does, which is why VU-style metering is built on it.

Peaks show the sharpest moment; RMS shows the weight. Match records on weight, which usually means by ear.

Dynamic range

Dynamic range is the distance between a track’s quietest and loudest moments. A wide range means the drop hits because the build was restrained; a narrow one means everything arrives at the same level.

Range is what a limiter needs to work with. A pre-flattened record gives the rig nothing to do and sounds smaller.

Loudness war

The loudness war is the decades-long trend of mastering records progressively louder so they stand out against whatever plays before them. It is measurable across eras and it cost dynamic range to achieve.

Records from different decades were mastered to different targets. That gap is why gain-matching is not optional.

Frequency range

The audible spectrum runs roughly 20 Hz to 20 kHz, and DJ mixers divide it into three: lows carry the kick and bass, mids carry vocals and most instruments, highs carry hats and air.

Lows collide hardest, mids collide most often, highs forgive. Most crowded blends are a mid problem.

Crossover

A crossover splits a signal by frequency and sends each part to the speaker built for it — lows to the subs, everything else to the tops. Every club system has one, set for its own speakers.

Subs and tops are different boxes fed by a crossover. That is why bass and vocals behave independently in a room.

Filter types

Filters differ by which part of the spectrum they remove. High-pass and low-pass cut one end, band-pass keeps a middle slice, notch removes a narrow sliver, and a shelf lifts or drops everything past a point.

Your mixer knob is high-pass and low-pass. Notch fixes a ringing room; shelves are what your EQ actually is.

Resonance

Resonance boosts the frequencies right at a filter’s cutoff point, so the sweep sings rather than simply removing content. Turned far enough up it can self-oscillate into a tone of its own.

Resonance makes a sweep sing. It is thrilling for four bars, exhausting after eight, and worse on a big system.

Cutoff

Cutoff is the frequency where a filter starts acting — everything above it on a low-pass, everything below it on a high-pass. Moving the cutoff is what a filter sweep actually is.

Move the cutoff, not the fader. A high-passed record stays present while getting out of the way.

Stereo image

Stereo image is where sounds appear to sit between the left and right speakers. In club production the low end is almost always mono and the width lives in the pads, effects and top end.

Bass is mono because width cancels when a system sums. Everything you hear as wide is happening up top.

Room modes

A room mode is a standing wave between parallel surfaces, where a frequency related to the room’s dimensions reinforces itself. It makes some bass notes boom and others vanish depending on where you stand.

One bass note twice as loud as its neighbours is the room, not the record. Move your head and it changes.

Ride cymbal

A ride is a large cymbal played in a steady repeated pattern, carrying the pulse the way a hi-hat does but with more sustain and a wash behind each hit.

A ride washes where a hat ticks. Two rides fill the top end continuously and a blend crowds up there.

Tom

A tom is a pitched drum with no snare wires, sitting between the kick and the snare in range. In dance music toms mostly appear in fills and in the descending rolls that lead into a drop.

Toms are pitched drums in the low-mids — the busiest region in any blend, and they can clash harmonically.

Pluck

A pluck is a short synth sound with a sharp attack and a fast decay, imitating a plucked string. It carries melody without sustaining, which makes it the most mix-friendly melodic element there is.

A pluck states its note and leaves. That is why pluck-led records layer where pad-led ones fight.

808 and 909

Two drum machines from the early 1980s whose sounds became the vocabulary of dance music. The 808 gave hip-hop its long sub-bass kick; the 909 gave house and techno their punchier kick and open hat.

An 808 kick is a pitched bassline and a 909 kick is a drum. That is why two 808 tracks fight and two 909 tracks do not.

Reverb

Reverb is the sound of a space — hundreds of reflections arriving after a sound and fading. As a DJ effect it is used to smear the tail of one record into the arrival of the next.

Reverb is a tail, not a texture — use it to end something, and pull it back before the next low end arrives.

Delay

Delay repeats a sound after a set time. On a DJ mixer that time is locked to the detected tempo, so the setting is a beat division rather than a number of milliseconds and the repeats land on the grid.

At 128 BPM — the catalog's busiest tempo, 36,548 tracks — one beat of delay is 469 ms, a half-beat 234 ms, and a full bar 1,875 ms.

Ping-pong delay

A ping-pong delay alternates its repeats between the left and right channels, so each echo bounces across the stereo field instead of stacking in the middle where the record already is.

Ping-pong widens as it repeats, which is why it survives a busy mix — the echoes sit where the track is not.

Tape echo

Tape echo is a delay modelled on a tape machine: each repeat comes back darker, slightly unstable in pitch and a little saturated. It degrades as it repeats rather than copying cleanly.

Each repeat loses top end, so a tape echo can run long without ever competing with the record coming in.

Phaser

A phaser sweeps a set of notches through the frequency spectrum, cancelling thin bands as it moves. The result is a hollow whoosh that circles rather than rising, and it never quite arrives anywhere.

A phaser moves without going anywhere — use it to hold tension through a long blend, not to signal a change.

Flanger

A flanger mixes a signal with a copy of itself delayed by a few milliseconds, and moves that delay. The interference produces a metallic jet-engine sweep — the same idea as a phaser, far more aggressive.

A flanger is the aggressive cousin of the phaser: a few milliseconds of delay, swept, and it eats the top end.

Bit crusher

A bit crusher throws away digital resolution on purpose — fewer bits of level, a lower sample rate, or both. The result is gritty aliased distortion that gets harsher the further you push it.

A bit crusher is a one-way door — ride it in and out across a bar rather than leaving it sitting on a record.

Pitch shifter

A pitch shifter moves a track up or down in pitch without changing its tempo. It is what key lock does continuously, exposed as an effect you can push in whole semitones.

One semitone of shift moves a track seven positions round the Camelot wheel — that is a key change, not a tweak.

Noise FX

Noise FX add broadband hiss, usually filtered and swept, on top of whatever is playing. They cover a transition rather than shaping it, filling the join with sound the ear is willing to accept.

Noise covers a join the ear would otherwise hear — it hides a bad edit, and it hides a good one just as well.

Beat FX

Beat FX are the effects section on a DJ mixer that locks its timing to the detected tempo. Every delay, echo, roll and gate is set in beat divisions rather than in milliseconds, so one setting stays musical across records.

Beat FX are only as accurate as the tempo they read — a wrong BPM puts every division fractionally off the grid.

Colour FX

Colour FX are the per-channel effects on the knob above each channel — filter, noise, crush, echo. Centred is off; turning either way engages the effect on that deck alone.

The colour knob is per channel, so it is the only effect you can put on one record without touching the other.

Send and return

A send takes a copy of a signal to an external effect; the return brings the processed version back into the mix. The original keeps playing, so the effect is added alongside rather than replacing it.

A send leaves the dry track playing, which is why an effect on a send can never make a record disappear.

Wet/dry

Wet is the processed signal, dry is the untouched original. The wet/dry control sets how much of each you hear, and on most DJ effects it is the only depth control there is.

Ride the wet control rather than switching an effect on: an effect that arrives is a move, one that appears is a mistake.

Saturation

Saturation adds harmonics by pushing a signal into gentle distortion. It makes a sound feel louder and denser without the meter moving much, which is why almost every commercial master has some.

Saturation buys perceived loudness without level — which is exactly why it hides from the meter you gain-match on.

Gate

A gate mutes a signal whenever it falls below a set threshold, so only the loud parts get through. It is the mirror of a compressor: one works on what is loud, the other on what is quiet.

A gate keeps the hit and loses the room around it — set the threshold by ear, then check it on the quiet passages.

Tremolo

Tremolo modulates volume up and down at a set rate. It is one of the oldest effects there is, and on a DJ mixer it is usually offered tempo-synced so the pulse lands on a division of the beat.

Tremolo moves volume, vibrato moves pitch. Synced to the beat it adds rhythm to something that has none.

Vibrato

Vibrato modulates pitch up and down at a set rate — the wavering a singer or a string player adds to a held note. As an effect it is subtle at low depths and seasick at high ones.

Pitch modulation on a whole mix wavers the drums too, which sounds broken. Use it only on isolated material.

Auto pan

Auto pan moves a sound between the left and right channels automatically, usually in time with the tempo. It creates motion without changing level, tone or pitch.

Dramatic in headphones, nearly inaudible on a floor. Judge it in the room, not on cans.

Freeze reverb

Freeze reverb captures the reverb tail at a moment and holds it indefinitely, producing a sustained wash that continues after the source stops. It turns a decay into a pad you can mix under.

Freeze the tail and it becomes a pad. It ends a record without silence and without losing energy.

Impact

An impact is a single dramatic hit — a crash, a reversed cymbal, a sub boom — used to mark a moment. It has no rhythm of its own and exists to make one beat feel bigger than its neighbours.

One hit to mark one moment. Use it to cover a cut, and use it rarely enough that it still means something.

Intro

The intro is the stretch at the start of a track built for mixing — usually drums and little else, running a fixed number of bars so an incoming record can be beatmatched and blended before anything melodic arrives.

On all 63 records we hold as both an extended mix and a radio edit, the extended cut is the longer one — by a median of 48 seconds, which at 128 BPM is 25.6 bars.

Outro

The outro is the stretch at the end of a track built for mixing out — the arrangement thinned back towards drums so the next record can come up underneath it without two vocals or two basslines colliding.

Count an outro in bars, never in seconds — 32 bars is a fixed amount of music and a shrinking number of seconds as the set speeds up.

Breakdown

A breakdown is the section where the drums fall away and the track opens out — pads, vocal, atmosphere — before the beat returns. It is the natural place to mix into, because there is very little left to clash with.

A breakdown is a hole in the arrangement, and a hole is exactly what a transition needs.

Build-up

A build-up is the climb out of a breakdown — a riser, a snare roll, filters opening — that tells a floor the drop is coming. It is arranged to land exactly on a phrase boundary rather than wherever it happens to finish.

A build-up points at one exact moment, so finish the transition before it starts or wait until after the drop.

Drop

The drop is the moment the full arrangement lands after a breakdown — beat, bass and hook arriving together. In most club records it is the point the whole track is arranged around, and the thing a floor is waiting for.

The drop is the one moment in a record where you have no room — mix before it or after it, almost never across it.

Hook

The hook is the part of a record people remember — the vocal line, the riff, the moment that makes it that track rather than any other. Everything else in the arrangement exists to set it up.

Mix around the hook, never across it — the room is following it, and two at once is the most obvious mistake you can make.

Riser

A riser is a sound that climbs in pitch or volume through a build-up, signalling that something is about to land. White noise, a filtered sweep or a rolling snare all do the job.

A riser is a countdown the whole room can hear, so treat it as a deadline for finishing whatever you started.

Sweep

A sweep moves a filter across a sound so its brightness travels — up towards a moment or down away from one. It works as an arrangement element inside a track and as a live move on a mixer.

A sweep announces itself, so spend it where you want the room to look — not on every transition.

Bridge

A bridge is a section that departs from the verse and chorus, usually once and late in a song, before returning. In club music it is rarer than in pop and often replaced by a breakdown.

The section that departs and returns. Not a bridge TRACK, which is a record that joins two genres.

Verse

A verse is the section that carries the narrative and changes its words each time, against a chorus that repeats. In club music the equivalent is usually a groove section that builds toward the drop.

Thin arrangement, held-back energy — the safest place to mix over a vocal record, and the easiest to miscount.

Second drop

The second drop is the return of a track’s main section after the middle breakdown. It is usually the biggest moment in the arrangement, and in club music it is frequently the point you are mixing out of.

The peak of the record. Have the next track ready before it arrives, and mix out on its way down rather than after.

False drop

A false drop is a build that resolves into something quiet or unexpected instead of the full arrangement, delaying the real drop. It is a deliberate production trick and a genuine hazard when mixing.

A build that resolves into nothing. It breaks the one assumption every timed transition relies on.

Cold open

A cold open is a track that starts on its full arrangement with no intro to mix over — the first beat is the record at full strength. Radio edits and older records do it constantly.

No intro, no runway. A cold open is a cut, a phrase-boundary drop, or a loop you built yourself.

Arrangement

The arrangement is the order and length of a track’s sections — intro, groove, breakdown, build, drop, outro. It is what you are actually mixing with, more than tempo or key.

Tempo and key say whether; the arrangement says where. It is the half no analysis on this site can see.

Extended mix

An extended mix is the DJ cut of a release — a longer intro and outro with more bars of beats at each end, so there is room to mix in and out. It is the version that belongs in a set.

56,070 of 443,414 titles with a duration (12.6%) say "Extended Mix", and they run to a median of 5:23 — slightly shorter than the 5:48 median of the catalog around them.

Radio edit

A radio edit is a shortened version cut for airplay — usually under four minutes, with the long intro and outro removed and the arrangement tightened. It is the version that gives a DJ the least to work with.

Only 803 of 443,414 titles with a duration (0.18%) say "Radio Edit", and they run to a median of 3:30 against 5:48 for the catalog — 2 minutes shorter.

Remix

A remix is a new production built from another artist’s parts — usually a different arrangement, often a different genre and tempo. The original vocal or hook survives; almost nothing else has to.

50,945 of 443,414 titles with a duration (11.5%) are remixes, and they run longer than the catalog they sit in — a median of 6:19 against 5:48.

VIP

A VIP — Variation In Production — is the producer’s own rebuild of their own track, usually made for their own sets. It is not a remix: same artist, same record, a different arrangement built to land harder.

1,431 titles in the catalog carry a VIP marker, and they run to a median of 4:18 — 1:30 shorter than the catalog’s 5:48.

Dub

A dub is a mix with the vocal stripped back or removed and the rhythm section pushed forward. It leaves long, sparse stretches to mix over, which is why the dub is so often the DJ-friendly cut of a release.

The 717 dub titles in the catalog run to a median of 6:10 — longer than the extended mixes at 5:23 and longer than the catalog as a whole at 5:48.

Bootleg

A bootleg is an unofficial edit or remix released without the rights holder’s permission. It circulates on USB sticks and private links rather than through stores, which is exactly why you will not find many for sale.

19 titles in a catalog of 443,414 carry a bootleg marker — roughly one in 23,000 — because a licensed store is the last place a bootleg can be sold.

Acapella

An acapella is a vocal with no instrumental behind it, released so DJs and producers can lay it over another record. It is the raw material for a mashup, and it is rarely sold alongside the tracks it came from.

7 titles in 443,460 carry an acapella marker. A licensed store catalog is not where acapellas live, and that number is the clearest way we can say so.

Edit

An edit is a rearranged version of an existing record — a longer intro, a trimmed breakdown, a drop moved — made by a DJ for their own sets. The original parts stay; the running order changes.

2,302 titles in the catalog are edits rather than radio edits — against 50,945 remixes, because most edits are never cleared.

Stems

Stems are the separated parts of a record — drums, bass, vocal, melody — as individual audio files. Modern players and software also generate them live from a finished stereo track.

Live separation removes a part; an EQ removes a frequency range — that is the whole difference.

Dubplate

A dubplate is a one-off record cut for a single DJ, historically onto acetate. In sound-system culture it is usually a personalised version of a track recorded specially for that DJ.

A dubplate is a record only you can play — the format changed, the exclusivity is the point.

White label

A white label is a record pressed with a blank or minimal label, sent out ahead of release or issued without official credits. It carries no artwork and often no artist name at all.

A white label arrives with no metadata — whatever you type in is all your library will ever know.

Track ID

A track ID is a request to name a record played in a set — and, in a tracklist, the placeholder "ID" standing in for a track that is unreleased or deliberately withheld.

An ID in a tracklist means the record is unreleased or withheld — not that the DJ forgot it.

Mashup

A mashup combines elements of two or more separate records into one — most often one track’s vocal over another’s instrumental. It is distinct from a bootleg, which is an unofficial edit of a single record.

Two records into one. Key and tempo have to agree first — everything else is arrangement.

Flip

A flip takes a record and turns it into something else — usually a different genre or tempo — while keeping a recognisable piece of the original. It is looser than a remix and more transformative than an edit.

A flip moves a record somewhere it could not otherwise go — usually a different tempo or genre.

Original mix

The original mix is the producer’s own primary version of a track, as distinct from remixes and edits of it. On dance releases it is usually the longest and most DJ-friendly cut on the record.

The producer’s own version, and usually the DJ-friendly one. Original does not mean shorter or plainer.

DJ tool

A DJ tool is a track built for mixing rather than listening — long, loopable, mostly percussive, with little melody or arrangement. It exists to bridge, extend and hold, not to be the record anyone remembers.

Long, loopable, barely melodic. It is the record that gets you out of trouble and nobody remembers.

Clean version

A clean version has explicit language removed, muted, reversed or replaced; the dirty or explicit version is the original. Which you need depends entirely on the room rather than on the record.

Carry both where you can. Cue points do not transfer between them, because the edits change the arrangement.

Remaster

A remaster reprocesses an existing recording — level, EQ, sometimes noise reduction — without changing the performance. Nothing is re-recorded and nothing is rearranged; only the presentation changes.

Same performance, different presentation — and usually louder. Gain-match it like any other record.

Forthcoming

Forthcoming means a track is signed and scheduled but not yet released. DJs are given it early to build demand, usually with an agreed date before which it should not be shared or posted.

Signed, scheduled, not out. Know the date, do not post it early, and say "forthcoming" when asked.

B-side

The B-side is the second side of a single — historically the less commercial track, often the one aimed at DJs. On digital releases the term survives as a name for the deeper cut on a two-track release.

The side chosen for clubs rather than radio. On older singles it is often the better DJ record.

Remix contest

A remix contest is a label or artist releasing stems publicly and inviting producers to submit versions, with the winner usually getting an official release. It is one of the few open doors into a label.

Stems provided, no introduction needed. It is the most open door a label has, and the losing entries are exclusives.

Official remix

An official remix is commissioned or approved by the rights holders, usually with stems supplied and a proper release. An unofficial one is made without permission, from the released audio, and circulates informally.

Official means stems and a release. Unofficial means a stereo master and no catalogue number.

Sync

Sync matches one deck’s tempo to the other automatically and holds it there, using the beatgrid the software calculated. It removes the arithmetic of beatmatching, not the decision about which record follows which.

Across 7,254 hand-sequenced transitions the median tempo correction is 0.83% — and on 27.4% of them there is nothing to correct.

Quantize

Quantize snaps your actions to the beatgrid: a cue point, a loop or a hot cue fires on the next grid line rather than the instant your finger lands. The setting decides how coarse that grid line is.

Set quantize to 1 beat for cue and loop work, and turn it off when you want to place something by hand.

Slip mode

Slip mode keeps the track running silently underneath whatever you are doing to it. When you release a loop, a scratch or a reverse, playback jumps to where the record would have been if you had never touched it.

Slip lets you loop, reverse or scratch over a mix and land back in phrase, because the track never actually stopped.

Loop roll

A loop roll repeats a short slice of the track — usually a beat or less — while the record keeps running underneath. Release it and playback continues from where it would have been, so nothing is lost.

Roll the last bar before a drop, halving the length as you go: 1 beat, then 1/2, then 1/4, released on the downbeat.

Hot cue

A hot cue is a saved position in a track that plays from that point the instant you press its pad. Most players store eight per track, and they are stored with the file rather than with the session.

Three cues cover most records: the first beat of the intro, the drop, and the bar the outro starts.

Memory cue

A memory cue is a saved marker you navigate to rather than trigger. It appears on the waveform and the player jumps to it when you call it up, without playing until you tell it to.

Use memory cues as the map of a record and hot cues as the controls you press.

Performance pads

Performance pads are the grid of rubber buttons on a controller or player. Each pad mode reassigns the whole grid to a different job — hot cues, loop rolls, slicing, samples or beat jumps.

Pick two pad modes and stay in them: hot cues for navigation, rolls for tension. The rest are for records you know.

Waveform

The waveform is the picture of a track’s level over time, usually coloured by frequency content. It is how DJs read a record’s shape without listening to it — where it thins out, where it lands, where it ends.

How tall a track draws is only loosely related to how hard it hits: loudness and analysed energy correlate at 0.32 across 443,242 tracks.

Beatgrid drift

Beatgrid drift is a grid that lines up at the start of a track and slides out of alignment later — the tempo the software stored is close to the real one but not equal to it.

Where our two tempo readings of a file disagree by more than 2 BPM, 54.8% are out by a musical ratio — double, 4:3 or 3:2.

Pitch bend

Pitch bend is a momentary speed change used to correct phase — nudging the jog wheel or holding a bend button to push a track forward or drag it back without altering its tempo setting.

Bend to fix where a track is, not how fast it runs — a touch on the platter, released the moment the kicks agree.

Needle drop

A needle drop is starting a track at a chosen point with no blend at all — dropping straight in on a downbeat, named for placing a stylus onto a moving record.

Drop on the first beat of a phrase with the outgoing track cut on the same beat — no overlap, no fade, no apology.

Beat display

The beat display shows where you are inside the current bar and phrase and, when two players are linked, how far the incoming track sits from the one already playing. It counts beats, not time.

Use the beat counter to find the phrase and the waveform to find the change. They answer different questions.

Needle search

Needle search is the touch strip beside the jog wheel that jumps playback to whatever point you touch, mapped left to right across the whole track. It is the digital equivalent of dropping a needle.

Needle search to get roughly there in one move, then the jog to get exactly there. Never the other way round.

Jog wheel

A jog wheel is the round control on a media player or controller used to nudge, scrub and scratch. Its touch-sensitive top behaves like a record; its outer ring bends pitch without stopping playback.

The outer ring nudges, the top scratches. In vinyl mode a hand on the top stops the record.

Platter

The platter is the driven metal disc a record sits on, spun by the motor beneath it. Its mass stores rotational energy, which is what holds speed steady when a hand touches the record above it.

The platter is the driven disc with real mass. A jog wheel imitates it; a motorised controller platter is one.

Censor

Censor plays the track in reverse for as long as the button is held, then returns playback to where it would have been if you had never pressed it. The timeline continues underneath; only what you hear changes.

Hold to reverse, release to land back in time. It hides a word without ever losing the beat.

Reverse play

Reverse play runs the track backwards and moves the playback position with it, so releasing it leaves you earlier in the record than when you started. Unlike censor, the position genuinely changes.

Reverse moves your position; censor does not. Turn slip on if you want the sound without the consequence.

Beat loop

A beat loop repeats a section of fixed musical length, set with a single press: one, two, four or eight beats. The player places the in and out points from the beatgrid, so the loop is musically exact.

One press, one exact loop — as accurate as the beatgrid behind it and no more.

Manual loop

A manual loop is set by pressing an in point and an out point by hand rather than choosing a beat length. It can be any duration, including one the beatgrid does not describe.

Set manual loops at home and beat loops in the booth. By hand is for what the grid cannot describe.

Beat jump

Beat jump moves playback forward or backward by a fixed number of beats while the track keeps playing, landing exactly in time. It skips or repeats sections without ever leaving the grid.

Jump in beats and you land in time. It is the fix for a phrase error nobody has to hear.

Key sync

Key sync shifts a track’s pitch so its detected key matches another track’s, independently of tempo. It is not key lock: key lock preserves pitch while tempo changes, key sync deliberately changes pitch.

Key sync moves a record into key; key lock stops tempo moving it. They are opposite tools with similar names.

Search

Search scans forward or backward inside the loaded track at speed; track search steps to the previous or next track in the browse list. They are adjacent buttons doing quite different things.

Search moves inside a track; track search replaces it. They are next to each other, which is the whole problem.

Fader start

Fader start makes a linked player begin playing the moment its channel fader or the crossfader leaves the bottom, and return to its cue point when the fader closes. Moving the fader replaces pressing play.

The fader becomes the play button. Check whether it is armed on unfamiliar gear before you touch anything.

Relay play

Relay play alternates two linked players automatically: when one track ends, the other starts, and the first loads the next track from its list. It plays music continuously with nobody at the decks.

Two linked players taking turns with nobody standing there. Useful before doors, and off before you play.

Sync vs beatmatching

Sync locks two tracks to a shared tempo using their analysed beatgrids. Beatmatching does the same by ear and hand. Sync is faster and depends on the analysis; beatmatching is slower and depends on you.

Sync inherits the grid’s errors. Learn to beatmatch so you can hear them, then use whichever fits the record.

Hot cue vs memory cue

A hot cue jumps straight to its point when pressed. A memory cue is a saved marker you step through and load into the deck’s cue position. One performs; the other navigates.

Hot cues are the eight places you launch from. Memory cues are the map. Use both, for different jobs.

CDJ

A CDJ is the club-standard media player: a jog wheel, a pitch fader, hot cues and a waveform display, playing from a USB stick, an SD card or a laptop. It carries no mixer of its own.

Two players and a mixer is the layout every club has, which is the argument for rehearsing on it.

Standalone player

A standalone player reads music straight from a USB stick or SD card. The decoding, the display and the cueing all happen inside the player, so nothing about the performance depends on a computer being awake.

Carry two sticks with identical exports, and format them the way the player’s manual asks.

All-in-one system

An all-in-one system puts two or four decks and a mixer in a single chassis and plays from USB with no laptop. It replaces a pair of players plus a separate mixer with one box and one power lead.

It buys the standalone workflow in one box, and costs you the layout a club booth actually has.

Controller

A controller is a jog-wheel-and-mixer surface that drives DJ software on a computer. It sends control messages rather than making playback decisions, and usually carries the soundcard that turns the software’s output back into sound.

The laptop is the instrument and the controller is the surface, so protect the laptop first.

Pro DJ Link

Pro DJ Link is the Ethernet network that joins several players and a mixer. One USB stick feeds every deck, the players share tempo and beat position, and lighting or recording software can read the whole rig from one connection.

One stick feeds every deck, and one bad Ethernet cable takes a player off the network silently.

DVS

A DVS — digital vinyl system — plays software tracks from real turntables or CD decks. A control record carries a timecode signal, an interface digitises it, and the software follows the position and speed of the platter.

When a DVS misbehaves, suspect the needle and the earth before you suspect the software.

Timecode vinyl

Timecode vinyl is a record pressed with a control signal instead of music. DVS software reads that signal to work out where the needle sits and how fast the platter is turning, then plays a digital track to match.

Flip the record when playback gets erratic — a worn side reads as a software fault and is not one.

Slipmat

A slipmat is a felt disc between the turntable platter and the record. It lets the platter keep spinning while you hold, drag or pull back the record itself, which is what makes cueing and scratching possible.

A mat that grabs is a worn or damp mat — replace it before you adjust anything on the deck.

Crossfader

The crossfader is the horizontal fader that blends between two channels. At one end you hear only the left assignment, at the other only the right, and a curve control sets how abruptly the handover happens in between.

Check the assign switches before you blame the deck — a channel assigned to the wrong side is silent.

Channel fader

A channel fader is the vertical level control for one deck. The crossfader chooses between two sources; the channel faders decide how much of each is in the room, which is where most club mixing actually happens.

Set the level with the gain, then use the fader for the move — never the other way round.

Rotary mixer

A rotary mixer replaces channel faders with knobs. It usually has no crossfader, an isolator-style EQ and a deliberately unhurried response — the design assumes long blends rather than cuts, and the format encourages them.

On a rotary you blend rather than cut, and the bass swap does the work a fader does elsewhere.

Isolator

An isolator is a three-band EQ that removes a band completely rather than attenuating it. Where a standard mixer EQ bottoms out around −26 dB, an isolator goes to silence, which makes a bass swap absolute rather than gradual.

A true kill makes the bass swap one decisive move; a −26 dB cut lets you blend the handover instead.

Pre-fade listen

Pre-fade listen sends a channel to your headphones before its fader is up, so you hear the next track while the room hears only what is already playing. It is what the cue button on every mixer does.

Only 1,428 of 7,250 transitions DJs build here arrive with tempo, level and key already matched; the rest is what the headphones are for.

Cue mix

The cue mix knob sets the balance in your headphones between the cued channel and the master output. Fully one way you hear only the track you are lining up; fully the other, only what the room is hearing.

Sit near the middle and let the room push you towards cue — the master is already reaching your ears.

Split cue

Split cue makes the headphones mono and sends the cued channel to one ear and the master to the other. You lose the stereo image and gain clean separation between the track you are cueing and the one playing.

Use it when the room is too loud to hear drift in a blend, and switch back when it is not.

Booth monitor

The booth monitor is the speaker pointed at the DJ, fed from its own output with its own level control. It is separate from the master, so turning it up changes what you hear and nothing the room hears.

Set the booth once, early, and reach for the booth knob rather than the master for the rest of the night.

MIDI

MIDI is the control language a controller speaks. It carries note and control-change messages rather than audio, each with a value from 0 to 127, which is how a knob movement becomes a parameter change in software.

A standard MIDI control has 128 steps across its whole travel, which is why some faders feel coarse.

MIDI mapping

MIDI mapping assigns a physical control to a software function. Most software has a learn mode: arm mapping, move the knob, click the function, and that control drives it until you change it again.

Export the map the day it works, and turn on soft takeover before you map a single knob.

Audio interface

An audio interface converts between the digital signal inside software and the analogue signal a mixer or amplifier accepts. In a timecode rig it also converts the other way, digitising the control signal coming off the turntables.

Raise the buffer until the dropouts stop, then stop — every increase is delay you will feel.

Line level

Line level is the standard signal strength equipment sends between devices — a player into a mixer, a mixer into an amplifier. It is far stronger than a microphone or turntable signal, which need preamplifying first.

Wrong input setting, not wrong gain: a player into phono distorts at every setting on the knob.

Ground loop

A ground loop is a hum caused by two pieces of connected equipment being earthed at different points, so current flows through the audio cable's shield. It sounds like a steady low buzz at mains frequency.

A steady hum that appears only when two devices are connected is a ground loop, not a faulty cable.

Balanced and unbalanced

A balanced connection carries the signal twice, once inverted, and cancels anything picked up along the way. An unbalanced one carries it a single time, so interference picked up by the cable stays in the signal.

Balanced cancels what the cable picks up, so it only matters on the long run out of the booth.

Phantom power

Phantom power is 48 volts sent up a balanced microphone cable by a mixer or interface to power a condenser microphone. It is switched on at the input, and most DJ equipment does not provide it.

A condenser mic needs 48V and most DJ mixers do not have it — bring a dynamic instead.

RCA and XLR

RCA is the unbalanced two-channel connector on players, turntables and consumer gear. XLR is the balanced three-pin connector used for long runs and microphones, and it locks into place.

RCA pulls out when somebody catches it; XLR locks — which is why the long run uses XLR.

Master output

The master output is the mixer socket that feeds the room. Everything you do on the channels arrives there summed, and its level knob decides how hard the club system is driven by the mix as a whole.

Set the master once, then never touch it. If the room is quiet, the answer is upstream or it is the venue engineer.

Zone output

A zone output is a third feed, separate from master and booth, sending the mix elsewhere in the building: a bar, a smoking area, a second room, usually with its own level control.

Somebody is listening to your set at a level you cannot hear and cannot change. Mix as if the bar can hear you.

Record output

The record output is a fixed-level copy of the master, taken before the master level control, so turning the room down does not turn the recording down. On modern mixers it is often a USB stream.

Record out is pre-master and fixed. What the room hears you can fix later; what the recording hears you cannot.

Phono input

A phono input accepts the tiny signal a turntable cartridge produces and applies RIAA equalisation to it, boosting the level by around 40 dB and restoring the bass that was deliberately cut when the record was pressed.

Thin and quiet means a turntable on line. Deafening and distorted means a line source on phono. Check the switch first.

Aux input

An aux input is a spare line-level input for a source that is not a deck: a phone, a laptop, a sampler, a guest’s interface. It usually has less control than a full channel.

Find the aux before doors, not during a changeover. It is the socket that rescues a guest with the wrong gear.

Mic input

A mic input takes the very low signal a microphone produces and amplifies it to line level, with its own gain, usually its own two-band EQ, and on club mixers a talkover control that ducks the music while someone speaks.

Gain down when the mic is not in your hand. It is the only input that can hear the room, and it will.

Talkover

Talkover automatically reduces the music whenever the microphone channel detects speech, then restores it when you stop. On club mixers the amount of the dip is adjustable, typically between about 6 and 24 decibels.

Set the dip depth once, at the level the room actually needs, and stop reaching for the master with a mic in your hand.

Two-channel vs four-channel mixer

A two-channel mixer takes two sources and is built around the crossfader; a four-channel takes four and is built around the channel faders. The choice is about how many things you want playing at once, not about quality.

Four channels for a club booth, two for scratching. The count is about how many sources, not about how good.

Headphone output

The headphone output is the mixer’s own amplifier feeding your headphones, with its own level control. What arrives there is set by the cue buttons and the cue mix knob, not by the channel faders or the master.

Cue one ear rather than two, and set the level in the quiet before doors. Nobody has ever recovered hearing.

Impedance

Impedance, in ohms, is how much a pair of headphones resists the signal driving them. Higher impedance needs more voltage for the same loudness, which is why one pair can be loud on one output and thin on another.

Buy DJ headphones between 32 and 64 ohms. High-impedance studio pairs are quieter on exactly the outputs you need them loud on.

Club standard

Club standard describes the equipment a working DJ can reasonably expect to find: two or more media players and a four-channel mixer, linked, with a booth monitor. It is a convention rather than a specification, and venues vary.

Ask what is in the booth before you agree to play it. "Club standard" is a convention, not a guarantee.

DJ booth

The DJ booth is the space the equipment sits in: the table, the monitor, the power, and where all of it sits relative to the floor. It is part of the instrument, because it decides what you can hear.

Arrive early enough to hear the booth before you have to play in it. Most booth problems take five minutes to fix.

Crossfader curve

Crossfader curve sets how quickly the sound arrives as the fader leaves its end stop. A sharp curve is fully open within a few millimetres; a smooth curve spreads the change across the whole travel.

Sharp curve to cut, smooth curve to blend. If your cuts smear or your blends step, this is the knob.

Magnetic fader

A magnetic fader senses position with a magnet rather than a wiper touching a conductive track. Nothing physically rubs, so the abrasion that eventually degrades every conventional one never begins.

Nothing rubs, so nothing wears. It is a durability upgrade first and a feel upgrade second.

Signal chain

The signal chain is the ordered path a sound takes from file to room: player, mixer channel, master, amplifier, speaker. Each stage has its own level and can only pass on what the last one delivered.

Set the level at every stage, not just the last one. A chain is only as clean as its worst gain decision.

Mixer channel

A channel is one vertical strip on the mixer and everything one source passes through: input select, trim, EQ, filter, cue, and the fader at the bottom. The controls act in that order from top to bottom.

A channel strip reads top to bottom in signal order. Fix a problem at the stage that caused it, not at the fader.

Amplifier

An amplifier takes the line-level signal leaving the mixer and raises it to the power a speaker needs. In a club it lives in a rack you will never see, usually behind a processor that handles crossover, delay and limiting.

You cannot make a club louder from the booth. Past the amplifier’s ceiling, extra level only buys compression.

Sub stack

A sub stack is the group of subwoofers handling the lowest octaves, usually on the floor and often in a block or a line rather than spread out. It carries the part you feel more than hear.

Walk the floor once a night. The booth is one seat in the room and the subs make it an unrepresentative one.

Club sound system

A club sound system is the whole chain after the mixer: processor, amplifiers, subwoofers, main speakers and often delay or fill speakers, tuned together for one room by an engineer who is not in the booth.

The system is already tuned for the room. Your EQ is a nudge on top of somebody’s measurements, not a rescue.

Feedback

Feedback is a loop: a microphone hears a speaker playing what the microphone just heard, and the loop builds until one frequency dominates and howls. It needs an open mic and a speaker the mic can hear.

Feedback needs an open mic and a speaker it can hear. Remove either one and it stops immediately.

CDJ vs controller

A CDJ is a standalone player that reads a USB stick and needs no computer; a controller is a surface that plays nothing on its own and drives software on a laptop. The difference is where the music lives.

Learn on whatever you can afford; rehearse on what the booth actually has before the booth is full of people.

DVS vs timecode vinyl

DVS is the whole system — software, an interface and control records — that lets a turntable play digital files. Timecode vinyl is one component of it: the record carrying the tone the software reads.

DVS is the system, timecode vinyl is the record inside it. Buy the records last, after the licence and the interface.

Insert

An insert breaks a channel’s signal path so an external processor sits inside it — the whole signal goes out, through the device, and back. A send copies the signal; an insert replaces it.

A send copies the signal, an insert replaces it. Reverb wants a send; a compressor wants an insert.

Scratch

A scratch is a sound made by moving a record back and forth under the needle while the crossfader or channel fader cuts it in and out. The hand sets the pitch; the fader sets the rhythm.

Every named scratch is two hands doing different things — the record sets pitch, the fader sets rhythm.

Baby scratch

The baby scratch is the first one anyone learns: push the record forward and pull it back in time with the beat, fader open throughout. No fader work at all — only the hand.

Push and pull to the beat with the fader open — get this in time before adding any fader at all.

Forward scratch

A forward scratch is a baby scratch with the return silenced: push the record forward with the fader open, then close the fader before pulling it back. Only the forward half is heard.

Close the fader on the way back and the scratch becomes a stab you can drop into a running mix.

Chirp scratch

A chirp starts with the fader open and closes it at the end of the forward push, then opens it partway through the pull back. Cutting off the tail of each motion is what makes the sound.

Cut the tail off both halves — the fader has to land mid-motion, not between motions.

Transformer scratch

A transformer scratch keeps the record moving slowly and steadily while the fader is stabbed open and shut, chopping one continuous sound into rhythmic bursts. The fader does all the work.

Hold a slow, even record motion and put the whole rhythm in the fader — this is a fader exercise.

Flare scratch

A flare starts with the fader open and clicks it shut one or more times mid-motion, so the sound is interrupted rather than started. One click is a one-click flare, two is a two-click.

The fader starts open and clicks shut mid-motion, so a missed click still leaves you with a sound.

Crab scratch

A crab is a flare played with the fingers rather than the thumb: the thumb holds tension against the fader while four fingers release it one after another, giving four clicks in one motion.

The thumb pushes back, four fingers release one at a time — four clicks in a single record motion.

Scribble scratch

A scribble is a fast tremble of the record made from the forearm rather than the wrist, with the fader left open. It produces a dense burst rather than an articulated pattern.

Tense the forearm and let it shake — this one is a texture you place, not a rhythm you count.

Hamster crossfader

Hamster is a crossfader wired in reverse, so the left deck lives on the right side of the fader. Scratch DJs run it because it puts the cut on the pull rather than the push.

Flip it, learn one orientation, and switch it back before anyone else plays on that mixer.

Backspin

A backspin is the record pulled sharply backwards while the platter keeps turning underneath, throwing the track back through itself. It is used as an effect mid-phrase and as a way out of a track.

The platter keeps spinning under the felt, which is why the track returns at pitch the moment you release.

Spinback

A spinback ends a track by throwing it backwards out of the mix — by hand on a platter, or with the reverse and brake controls on a player that has none. No beatmatching required.

606 of 7,254 transitions DJs sequence here join two records no pitch fader can bring together — an exit, not a blend.

Brake

A brake is a controlled slowdown to a stop, either by killing the turntable motor or with the brake control on a player. The pitch falls with the tempo, which is the whole effect.

The brake time is the whole effect — a quarter-bar reads as a stutter, two bars as a power cut.

Reload

A reload is pulling a track back to its start and dropping it again, usually seconds after the moment the crowd reacted to. It is native to jungle, drum and bass, garage and dubstep.

A reload answers a reaction that already happened — if the room did not move, do not pull it back.

Vinyl simulation

Vinyl simulation is the setting that makes a jog wheel behave like a platter: touching the top stops the track, the side nudges it, and releasing lets it spin back up to speed.

With vinyl mode off, the top of the jog wheel only bends pitch — nothing you do will produce a cut.

Turntable

A turntable spins a record at a constant speed while a stylus tracks its groove. A DJ turntable adds a pitch fader, high torque so it reaches speed instantly, and a platter you can hold and release.

A DJ turntable is built to be interfered with: high torque, heavy platter, slipmat, and a pitch fader you can reach.

Tonearm

The tonearm carries the cartridge across the record, holding the stylus in the groove at a controlled angle and force. Its counterweight sets that force and its anti-skate opposes the pull toward the centre.

The arm is a balance, not a bracket. Zero it first, then set force and anti-skate — in that order, every time.

Cartridge

A cartridge converts the stylus’s movement in the groove into an electrical signal. It mounts to the tonearm, holds the replaceable stylus, and its design decides how securely a record tracks under handling.

Buy a DJ cartridge, not a hi-fi one. It is built to stay in the groove while somebody is holding the record.

Stylus

The stylus is the small shaped tip that rides the record groove, mounted on a cantilever inside the cartridge. It is a wear part: the tip erodes with use and eventually starts damaging records rather than reading them.

A worn stylus damages records and sounds fine until it does not. Replace on hours played, not on how it sounds.

Counterweight

The counterweight is the adjustable mass at the back of the tonearm. Sliding it changes how much of the arm’s weight rests on the stylus, which is how tracking force is set.

Float the arm level first, then zero the dial without moving the weight. The numbers mean nothing before that.

Anti-skate

Anti-skate applies a small outward force to the tonearm to oppose the inward pull a rotating record exerts on it. Without it, the stylus presses harder on the inner groove wall than the outer one.

Match anti-skate to tracking force for playback. For scratching, most turntablists wind it to zero on purpose.

Tracking force

Tracking force is how hard the stylus presses into the groove, measured in grams and set by the counterweight. Too little and the stylus leaves the groove; too much and it wears both the tip and the record.

Use the force the cartridge specifies. If it still skips, the problem is level, vibration or a worn stylus.

Record weight

A record weight is a heavy disc placed over the spindle to press a record flat against the platter. It improves contact on warped records and adds mass to the platter, which resists small speed variations.

A weight fights the slipmat, so it belongs on a listening deck. The exception is a warped record you must play.

Torque

Torque is the rotational force a turntable’s motor applies to the platter, usually quoted as start-up torque in kilogram-centimetres. High torque means the platter reaches speed almost instantly and resists being slowed.

High torque is what makes a release land on the beat. It is also what you are fighting when you hold a record.

Direct drive

On a direct-drive turntable the motor turns the platter itself; on a belt drive an offset motor turns it through an elastic belt. The belt isolates motor vibration and, in doing so, removes the instant response DJs need.

Direct drive for anything you touch, belt drive for anything you only listen to. The belt is what removes the response.

33 and 45 rpm

Records are cut for one of two rotation speeds: 33⅓ rpm, which fits more music per side, or 45 rpm, which uses more groove per second and so carries more detail and level. The deck must match the pressing.

Wrong speed is the fastest fault to hear and to fix. Twelve-inch club pressings are 45 more often than people expect.

45 adapter

A 45 adapter fills the large centre hole found on many seven-inch singles so they sit on a standard spindle. Some are a small disc that drops in; others are a full platter-sized puck.

If you own seven-inch singles, carry two adapters. It is the cheapest thing that can end a set.

Slip cue

Slip cueing is holding a record still with the platter turning underneath it, then releasing on the beat. The slipmat allows the platter to keep spinning, so the record is at full speed the instant you let go.

Hold the record, let the platter spin, release on the beat. This is slip cueing, not slip mode on a player.

Battle mixer

A battle mixer is a compact two-channel mixer built around a fast, replaceable crossfader, with curve and reverse controls to hand. Everything else is stripped back to keep the fader area clear.

A battle mixer is defined by what it leaves out. Everything removed was in the way of one hand.

Battle position

Battle position turns the turntables ninety degrees so the tonearms sit at the back rather than the right, and the pitch faders face you. It puts the record surface and the crossfader in one continuous working area.

Rotate the decks ninety degrees and the tonearm stops being where your hand needs to be.

Routine

A routine is a composed, rehearsed sequence of scratches, juggles and cuts performed to a set piece of music. Unlike a mix, it is written in advance and repeated the same way each time.

A routine is composed and rehearsed, not improvised. Build it in phrases and rehearse the ending hardest.

Body tricks

Body tricks are scratches performed in a visually difficult way — behind the back, under a leg, with an elbow, facing away from the decks. The sound is ordinary; the difficulty and the spectacle are the point.

Learn the scratch until it is boring, then learn it behind your back. Never the other way round.

Tweak scratch

A tweak scratch is performed with the motor off, so the record only moves when your hand moves it. Without a platter pulling underneath, the sound follows the hand exactly and can be pushed into rhythmic patterns.

Motor off, and the record does exactly what your hand does. It is the cleanest way to hear your own timing.

Orbit scratch

An orbit is any scratch pattern repeated identically on the way back as on the way out, so the fader clicks land symmetrically in both directions. Most commonly it describes a flare performed both ways.

An orbit is a pattern performed identically in both directions. The backward half is the half that gives you away.

Drag scratch

A drag is a scratch performed deliberately slowly, pulling the record at well under playing speed so the sound stretches downward in pitch. The fader usually stays open throughout.

A drag is a scratch made slow on purpose. It is the one that works in a club, because it reads as an effect.

Hydroplane

A hydroplane is made by resting a finger or the side of a hand lightly on the spinning record so it stutters against the platter, producing a rapid fluttering sound without moving the record back and forth.

Rest a finger on a spinning record and let it stutter. The slipmat, not your hand, decides whether it works.

Crate

A crate is a folder of tracks inside your DJ software, named after the boxes vinyl DJs carried. A track can sit in as many crates as you like without being copied, because a crate holds references rather than files.

26.9% of a real DJ library sits in no crate at all, and the median track sits in exactly one.

Crate digging

Crate digging is the search for records nobody has handed you — going past the charts and the promo mail into back catalogue, reissues and things filed where you were not looking.

Of the 110,237 tracks whose true first-release year we have researched, 10,237 carry a store date at least two years later — a median of 10 years later.

Playlist vs crate

A crate is a collection of tracks you might play; a playlist is a running order you intend to play. The distinction is order — a crate is a box, a playlist is a sequence.

If the order carries information, it is a playlist. If it does not, it is a crate — and mixing the two costs you both.

ID3 tags

ID3 tags are the metadata written inside an audio file — title, artist, album, genre, year, comment, and on DJ files often BPM and key. They travel with the file rather than with the software that read it.

Our catalog carries a tempo on 443,307 tracks and a key on 443,414 of 443,460 — and an ISRC, the one identifier built to survive a re-release, on zero.

Library database

Your DJ software keeps its own database of everything it knows about your collection — file locations, beatgrids, cue points, crates, play history. The audio files sit elsewhere on disk; the database is what turns them into a library.

Back up the database, not just the music — the audio is replaceable and the grids, cues and crates are not.

Duplicate detection

Duplicate detection finds the same record stored more than once — usually by comparing artist and title after normalising punctuation and case, sometimes by duration or by an identifier inside the file.

Matching on normalised artist and title, 357 groups in our catalog hold the same record twice — and dropping the version suffix finds 1,464 more.

Relinking missing files

Relinking points your library’s database back at audio it can no longer find, after the files were moved, renamed or unplugged. The track entry survives with its grids and cues; only the path to the audio is broken.

Relink, never re-import: the entry still holds your grids and cues, and re-adding the file throws them away.

Comment field

The comment field is free text inside an audio file, and the only metadata slot nobody else is using. DJs fill it with the things no other field holds — energy ratings, where a record works, what it mixes into.

Just over half a real DJ library carries a comment — 49.8% — and the median one is 14 characters long.

Tag

A tag is a label you attach to a track so you can find it by something other than its name — a genre, a mood, a situation. A track can carry as many as you like.

The catalog runs to 168 genre tags, but 395,353 of 443,460 tracks carry exactly one — a store files a record in a single place.

Cue sheet

A cue sheet is a small text file listing what plays when inside one long audio recording — track titles, artists and start times. It is how a recorded mix is split into a tracklist without being cut into separate files.

Write the cue sheet from the recording, not from memory: the times are the part you will get wrong.

USB prep

USB prep is exporting the tracks, grids, cue points and playlists you need onto a drive a club player can read. What is not exported does not exist once you are behind the decks.

Export twice, onto two drives, and test one in a player before you leave — not in the software that wrote it.

Set list

A set list is the running order a DJ intends to play — the sequence rather than the collection. How long it needs to be is arithmetic: slot length divided by how long the records actually run.

The median track in our catalog runs 5:48, so a two-hour set played back to back is about 21 records — and half that again is a sensible list.

M3U playlist

An M3U is a plain text file listing paths to audio files in order. Almost every application can read one, which makes it the lowest common denominator for moving a running order between programs.

Use M3U to hand an order to another program, and expect nothing else to travel with it.

Sample rate

Sample rate is how many times a second a digital file measures the waveform, in kilohertz. CD audio is 44.1 kHz, and the number sets the highest frequency the file is able to carry.

44.1 kHz already covers everything a human hears — higher rates buy production headroom, not a better club file.

Bit rate

Bit rate is how much data one second of audio uses, in kilobits per second. It decides the file size, and on a lossy format it decides how much of the original recording survives the encoding.

The median track here runs 5:48, which is 61.4 MB as a WAV and 13.9 MB at 320 kbps — about 2,298 tracks on a 32 GB drive, against 521.

FLAC

FLAC is a lossless compressed format: it shrinks a file without discarding any audio, so decoding returns the original samples exactly. It typically lands around 60% the size of the WAV it came from.

FLAC holds 5.2% of a real DJ library — behind AIFF, ahead of WAV, and closer to both than the arguments about them suggest.

WAV and AIFF

WAV and AIFF are uncompressed audio containers — the raw samples, no encoding. They sound identical to each other and differ mainly in how they store tags and which software wrote them.

AIFF outnumbers WAV in real DJ libraries — 6.6% against 4.9%.

AAC and M4A

AAC is a lossy codec, usually delivered in an .m4a container, and it is what Apple’s ecosystem and most video use. At the same bit rate it generally holds up better than MP3.

AAC barely appears in a real DJ library — 1.4% of files, against 81.9% MP3.

Lossless

Lossless means the encoding discards nothing: decode the file and the original samples come back bit for bit. WAV, AIFF, FLAC and ALAC are lossless; MP3 and AAC are not.

Lossless is 16.7% of a real DJ library, and it splits three ways — no one format has won the argument.

Lossy compression

Lossy compression shrinks a file by discarding audio a listener is unlikely to notice. What it removes is gone permanently, and encoding an already-lossy file removes more on top.

83.3% of the files in a real DJ library are lossy — whatever the forum argument says, it is settled in practice.

Record pool

A record pool is a subscription service supplying DJs with promotional music, usually including edits, intro versions and clean radio cuts that are not sold anywhere else.

A pool ships the versions stores do not sell — and enough volume to bury a library if you let it.

Play count

Play count is the number the software increments each time a track is played past a threshold. It is the only field in a library that records what you actually did rather than what you intended.

71.1% of a real DJ library has never been played once, and the tracks that have been played sit at a median of 2.

Star rating

A star rating is a one-to-five score you assign a track by hand. Nothing writes it for you, which makes it the most deliberate field in a library and the one most often left empty.

85.2% of a real DJ library carries no star rating at all, and just 1.8% of it ever gets five.

Track colour

Track colour is a single colour swatch you can attach to a track, shown beside it in the browser. It carries no meaning of its own — whatever scheme you invent is the entire content of the field.

4.4% of a real DJ library carries a colour tag, spread across just 8 colours. Almost nobody uses this field.

Smart playlist

A smart playlist is a saved rule rather than a saved list. You describe what belongs in it — tempo band, genre, rating, date range — and the software fills and refills it as the library changes.

BPM is filled on 99.0% of a real DJ library and star rating on just 12.9% — a smart playlist only reaches the fields you actually filled in.

Folder structure

Folder structure is how the audio files sit on disk, which is a separate question from how the library is organised inside DJ software. The software points at files; folders decide whether that pointer survives.

Organise inside the software and keep folders boring. Every folder you reorganise is a relink you scheduled for later.

File naming

File naming is the convention behind the filenames themselves — usually artist, title and mix name. It matters because the filename is the one piece of metadata that survives when tags are missing, stripped or wrong.

Artist, dash, title, mix in brackets. The filename is your metadata backup, so make it readable by a stranger.

Artwork

Artwork is the image embedded in a track’s tags and shown in the browser and on the player display. It is stored inside the file, so it travels with the track and adds to its size.

Artwork on everything, at around 500 pixels. It is the fastest thing to recognise in a dark booth and the easiest to oversize.

Analysis file

An analysis file is the small companion file DJ software writes beside each track holding its waveform, beatgrid and cue data. The audio file is untouched; everything the player draws comes from here.

A flat waveform on a club player means the analysis file did not travel. The audio is fine; the export was not.

XML export

An XML export is a single text file describing your whole collection — every track’s path, tags, tempo, key, cues and playlists. It is how one piece of DJ software hands a library to another.

The XML is a snapshot, not a connection. Re-export before you use it, every time, or you are importing last month.

Backup

Backing up a DJ library means copying two separate things: the audio files, and the database holding the cues, grids, playlists and history. Losing either one loses years of work, and they live in different places.

Back up the database, not just the music. You can buy the tracks again; you cannot buy your cue points back.

Library sync

Library sync keeps one collection consistent across more than one machine — a laptop, a desktop, a studio computer — either through the vendor’s cloud service or by keeping the database and audio on a drive you carry.

Pick one machine as the master and let the others read. Two authoritative libraries is not sync, it is a merge.

Two USB sticks

Bringing two identical prepared USB sticks is the standard club precaution. Sticks fail, get left in players and get taken by mistake, and the second one turns any of those from a disaster into a pause.

Two identical sticks, both tested in a real player, one never in the same pocket as the other.

Export mode

Export mode is the state in which DJ software acts as a preparation tool — organising, analysing and writing to a device — rather than playing anything. Performance mode is the other state, where the same software plays.

Prepare in export mode, play from a stick. Playing off a laptop over the link makes the laptop the thing that can fail.

Device library

A device library is the database written onto a USB stick alongside the audio, holding the playlists, cues, grids and search index the player reads. It is a separate export from your computer’s own library.

A stick is a database plus audio. Older players read only the older database, which is why one club rejects it.

History playlist

A history playlist is the list DJ software and club players record automatically as you play — every track, in order, with a timestamp. You do not create it; it is written whether or not you ask.

Import the history off the stick before you unpack. It is the only unedited record of the set you just played.

Related Tracks

Related Tracks is a browse mode on club players that filters your own library against the track currently loaded — same key, similar tempo, same genre — so the next choice comes from a shortlist instead of the whole stick.

Let the player narrow the stick and let yourself pick from what is left. It filters fields, it does not know rooms.

Search filter

The search filter narrows the browse list on a player by typed text or by field — genre, artist, key, BPM band, rating, colour — so you can find a track on a stick of thousands without scrolling through them.

Filters beat typing under pressure. Set up two or three that reach a short list in a few presses.

Key detection

Key detection estimates a track’s musical key from the audio by measuring which pitches dominate and matching that profile against major and minor templates. It is an estimate, and it is confident even when wrong.

Trust key detection for sorting and check it by ear before you build a transition on it.

BPM detection

BPM detection finds the repeating pulse in a track by measuring where energy rises and looking for the interval that best explains those onsets. It returns a tempo and a grid, and both can be right about the wrong thing.

Check the octave before you trust the number. Half and double are the errors that survive looking correct.

Batch analysis

Batch analysis runs the tempo, key, grid and waveform detection across many tracks at once rather than as each one loads. It is processor-heavy, takes hours on a large library, and only has to happen once per track.

Analyse everything before it reaches a stick, and pick the right grid mode rather than accepting the default.

Ogg and Opus

Ogg is an open container, usually holding Vorbis audio; Opus is a newer open codec that outperforms both at low bitrates. Both are lossy, both are free of licensing, and neither is standard in DJ software.

Good codecs, wrong ecosystem. If an Ogg or Opus file matters, buy it properly in a format your players read.

Variable bitrate

Variable bitrate spends more data on complex passages and less on simple ones, so quality stays even and file size varies. Constant bitrate spends the same everywhere, so size is predictable and quality is not.

Buy whatever the store sells. Variable bitrate is fine on modern players and the old seeking objection has aged out.

Joint stereo

Joint stereo encodes what the two channels share once and only the difference separately, rather than encoding each channel in full. At normal bitrates it buys quality; at very low ones it can narrow the stereo image.

Joint stereo at 320 is what makes an MP3 good. The image-collapse warning belongs to 128 kbps and 2001.

24-bit audio

Bit depth sets how finely each sample is measured. Sixteen bits gives about 96 dB between the quietest and loudest representable sound; twenty-four gives about 144 dB, at one and a half times the file size.

Sixteen bits already exceeds what a club room can resolve. Buy 24-bit for producing, not for playing.

FLAC vs WAV

FLAC and WAV hold identical audio. FLAC compresses it losslessly to roughly 60% the size and carries tags cleanly; WAV stores it raw, is universally readable, and handles metadata badly.

Identical audio, so decide on tags and space: FLAC for the library, WAV only where something refuses to read FLAC.

DJing with streaming

Some DJ software can play tracks streamed from a music service rather than from files you own. It works, and it introduces a dependency on a network connection at the exact moment you cannot afford one.

Fine for preparing and for parties. In a booth, anything you plan to play should be cached or owned.

Trainwreck

A trainwreck is a transition that falls apart in public — beats drifting out of phase, two basslines fighting, the floor noticing. Every DJ has had one, and most of them start with tempo rather than with key.

Only 5.05% of 7,243 hand-sequenced transitions jump more than 20 BPM. The median gap is 1.0 BPM and 81.5% land within 3.

Transition

A transition is the move from one track to the next — the overlap where both are playing and the point where the first is gone. It is the unit a set is actually built from, rather than the tracks themselves.

We hold 96,963 measured pairings across 12,354 artists and 5,622 community-rated transitions, on top of 7,243 sequenced by hand here.

Blend

A blend is a transition where both records play together for a stretch — long enough that the overlap is part of the music rather than a join between two pieces of it.

Across 7,243 transitions sequenced by hand here, the median energy gap between adjacent tracks is 4 points on a 100-point scale — DJs blend into records that feel almost identical.

Cut

A cut swaps one record for another on a single beat, with no overlap. It is the fastest transition there is and the only one that works between two records with nothing in common.

A cut needs only one thing to be right — the beat it lands on. That is what makes it the move for incompatible records.

Double drop

A double drop lands the drops of two records at the same instant. Done right it is the biggest moment a DJ can manufacture; done wrong there is no way to hide it.

Both drops have to land on the same bar, at the same tempo, in compatible keys — and there is no partial version to retreat into.

Doubles

Playing doubles means running two copies of the same record at once, offset or in sync. It is used to extend a section, to loop a passage live, or to juggle a phrase between decks.

Two copies offset by a phrase let you hold one section indefinitely — cut back before it ends and it never resolves.

Echo out

An echo out ends a record by feeding its last bars into a delay and pulling the channel down, so the track dissolves into repeats instead of stopping.

An echo out manufactures an outro for a record that never had one — and covers a transition between two tracks with nothing in common.

Bass swap

A bass swap hands the low end from one track to the other in a single move: the incoming bass comes up at the exact moment the outgoing bass goes down, so only one record is ever carrying the bottom.

One record carries the bass at any moment. Swap on a downbeat, both hands together, and it disappears.

Quick mixing

Quick mixing plays a short section of each record, often thirty to ninety seconds, before moving to the next. It is a style of set rather than a transition, and it depends on knowing which section matters.

Play the part that matters and leave. Quick mixing lives or dies on cue points set before you arrive.

Drop swap

A drop swap cuts from one track to another exactly at a drop, so the incoming record’s drop replaces the outgoing one. Only one drop is heard — which is what separates it from a double drop.

Cut at the drop so only one is heard. It steals the double drop’s moment without the harmonic risk.

Loop out

Looping out holds the end of a track in a loop so it keeps playing while you bring the next one in. It replaces a fixed outro with one you can extend for as long as the transition needs.

A loop turns a fixed outro into one you control. Four or eight bars of the last instrumental section is usually enough.

Filter fade

A filter fade uses the mixer’s filter rather than the fader to move between records: the outgoing track is high-passed until only its top remains, while the incoming one opens up from below.

Filter rather than fade and nothing gets quieter — the outgoing track just stops taking up the bottom.

Fade out

A fade out lowers a track’s level to nothing over several bars. As a transition it is the simplest move available; as an ending it is the one that tells a room the night is over.

A fade removes energy without replacing it. That is wrong mid-set and exactly right on the last record.

Layering

Layering plays two records together for an extended period as a deliberate combination rather than as a transition — a loop under a track, a percussion record over a groove, an acapella over an instrumental.

Layering is subtraction. Strip one record to the part that adds something and leave the other whole.

Beat juggling

Beat juggling builds a new rhythm from two copies of the same record by alternating between them, cutting and rewinding each so that bars and beats land in an order the original never had.

Two copies of one record, alternating, until the pattern is something the original never played.

Chop mix

A chop mix alternates rapidly between two playing tracks using the crossfader, taking a bar or a phrase from each in turn so the two records trade the floor rather than blending into one another.

Trade whole bars between two running records. A chop is meant to be heard, which is the opposite of a bass swap.

Phrase matching

Phrase matching aligns the structural sections of two tracks, not just their beats — so the incoming record’s first bar lands on the outgoing record’s phrase boundary and both arrangements move together.

Start the incoming record on a phrase boundary, not just on a beat. Off by four bars is in time and still wrong.

Rolling transition

A rolling transition keeps a continuous rhythmic bed running while the tracks change underneath it — usually the outgoing drums held while the incoming record establishes itself, so nothing ever stops.

Keep one rhythm running and change everything around it. The floor never gets a moment to stop moving.

Spin-in

A spin-in launches the incoming record by spinning it forward by hand into its first beat, so it arrives with an audible rising whoosh rather than simply starting. It is the entrance counterpart of a spinback.

Spin the incoming record into its first beat so the arrival is heard. This is an entrance, not a blend.

Tease

Teasing plays a brief, recognisable fragment of a record — a few bars of a hook or a vocal — then takes it away without mixing it in. The record itself arrives later, or sometimes not at all.

Play four bars of something they know and take it away. The withdrawal is the technique, not the fragment.

Breakdown blend

A breakdown blend brings the incoming track in during the outgoing record’s breakdown, using the gap where the drums have dropped out as the space to introduce a new groove without two rhythms competing.

Mix where the drums already left. The trap is spending two breakdowns in a row and losing the floor in the gap.

Tempo ramp

A tempo ramp raises the tempo gradually across a set, a fraction at a time, so the night speeds up without any single transition sounding like a jump. It is a set-level move made one transition at a time.

Half a BPM at a time and nobody notices. The same climb in one transition and everybody does.

Pitch riding

Pitch riding makes continuous small corrections to the pitch fader to hold two records in time by hand, rather than nudging the platter. It compensates for drift over a long blend.

Correct the drift with the fader, not the platter. A nudge fixes a beat; the fader fixes the reason.

Peak time

Peak time is the stretch of a night a set is built toward — the busiest hour, and the point of highest energy. It names a position in a night rather than a specific sound.

The genre tag named for it is not the hardest music in the catalog: Techno (Peak Time / Driving) holds 24,997 tracks at a mean energy of 66, 6th of the 33 genre tags with 4,000 or more analysed tracks.

Warm-up

A warm-up is the opening stretch of a night — slower, quieter, and built to leave the next DJ somewhere to go. Playing peak-time records in a warm-up is the oldest mistake in the job.

Opening tracks in the 518 sets built here average 55 for energy against 63 in the closing third — DJs really do start low and climb.

Closing set

A closing set is the last stretch of a night, played after the peak has passed. Its job is to land the room rather than lift it, which is why closers are rarely the hardest records of the night.

Across 518 sets sequenced by hand here, the closing track averages 61.7 on energy against 63.2 for the last third before it — sets peak before they end, not at the end.

Energy curve

An energy curve is the shape a set makes over time — where it starts, how steeply it climbs, where it peaks. It is the plan behind a running order, and the thing a crowd feels without being able to name.

Hand-sequenced sets climb 55.0 → 57.3 → 60.7 → 63.2 across their opening, first, middle and last thirds, then step back to 61.7 on the closing track.

Back-to-back

A back-to-back set is two or more DJs alternating tracks on the same system. Each plays into whatever the other left, so nobody controls the direction of the set on their own.

The 7,243 hand-sequenced transitions we measure come from 716 sets built by 515 different DJs — and 70.5% of their moves are textbook Camelot, against 18.3% by chance.

Open format

An open format DJ plays across genres in one set — hip-hop into house, disco into garage — rather than staying inside a single style. The joins are made on tempo, energy and key instead of on genre.

457 of 717 sets built here cross a genre boundary at least once — open format is the majority case, not a niche.

All night long

An all night long set is one DJ playing the entire night — opening the room, taking it through peak time and closing it — with no other DJ on the bill.

The discipline is at the front — anything that would win an hour makes hour five impossible.

Floor filler

A floor filler is a record that reliably brings people to the dancefloor. It is defined by what it does in a room rather than by anything in the music, so it is one venue’s and not another’s.

Defined by what it does in a room, not by what is in it. And it only works because of what surrounds it.

Secret weapon

A secret weapon is a record that works as reliably as an anthem but that almost nobody else is playing — an old B-side, an unreleased edit, something from a scene the room does not follow.

It has to work first and be rare second. Obscure and ineffective is just obscure.

Track selection

Track selection is choosing what to play and in what order — the decisions rather than the mixing. It is what separates two DJs with identical technical ability and identical libraries.

Choosing what and when. It cannot be drilled alone, which is why DJs improve in rooms and plateau in bedrooms.

Set prep

Set prep is everything done before the gig — choosing candidate records, checking cues and grids, building crates, and exporting a stick. It is preparation for decisions rather than a script for them.

Prepare the pool, not the running order. A fixed tracklist stops matching the room about twenty minutes in.

Emergency track

An emergency track is a record you keep for when a set is going wrong — something that has never failed in that kind of room, kept somewhere you can find it in five seconds without browsing.

Chosen in advance, findable in five seconds. The moment you need it is the moment you cannot think.

Clearing the floor

Clearing the floor is emptying a dancefloor with a bad choice or a bad transition. It happens to everyone, and what separates DJs is how long it takes them to notice and what they do next.

It is usually one decision, so it is recoverable. Change course on the next record, not the fourth.

Dancefloor

The dancefloor is the space people dance in, and as a DJ term it means the crowd rather than the room — "the floor is with you" describes a state of attention, not a set of tiles.

Half full needs permission, full needs direction. Most of what makes a floor work is not the music at all.

Dry run

A dry run is playing a set through before the gig, on your own gear, start to finish and without stopping. It tests the material and the workflow rather than producing a tracklist to follow.

Start to finish, no stopping. Playing through a mistake is the only way to practise the recovery.

Mixtape

A mixtape is a recorded, continuous DJ mix released as a piece of work in its own right rather than as a document of a gig. It is arranged for listening rather than for a dancefloor.

Arranged for a listener, not a floor. Shorter, more varied, and willing to go quiet in a way a set is not.

Guest mix

A guest mix is a recorded mix made for someone else’s platform — a label’s series, a radio show, a podcast, another DJ’s channel. It reaches an audience that has not chosen you, which changes how it should be built.

Somebody else’s audience, already assembled and already trusting the host. Sound like the series and like yourself.

Live stream

A live stream is a set broadcast in real time to an online audience. The mixing is the same; the room is not, and almost everything that makes a club set work is missing from the feedback loop.

No room to read, and matching systems that act in real time. Plan the shape in advance and check the platform.

Set time

Set time is the length of the slot a DJ is booked for — the number that decides everything else about the set, from how many records fit to how fast the energy can move.

The median set built here runs 41.1 minutes across 9 tracks — a warm-up slot, not a headline one.

Headliner

The headliner is the billed act a night is sold on, playing the slot the room is fullest for — usually peak time rather than the last set of the night.

The headline slot is where the room is fullest, which is rarely the last set of the night.

Residency

A residency is a regular booking at one venue — weekly, monthly or seasonal — where the same DJ plays often enough that the room, the sound system and the crowd become familiar.

A residency lets you introduce a record in June and have the room recognise it in September.

Promoter

A promoter books the acts, hires the room, sells the tickets and carries the financial risk of a night. They decide who plays, in what order, and for how long.

Answer with what you can cover, not what you want — the slot on offer is usually a budget decision.

Soundcheck

A soundcheck is the time before doors to test your setup through the venue system — levels, monitoring, connections — so that nothing is discovered for the first time in front of a room.

Check the connections and the monitor, not the sound — an empty room tells you nothing about a full one.

Green room

The green room is the space set aside for artists at a venue — somewhere to wait, store equipment, and be away from the floor before and after a set.

It is where your bag is safe and where the DJ coming off gets ten minutes — treat it as both.

Rider

A rider is the document setting out what a DJ needs to perform — the technical rider lists equipment and setup, the hospitality rider covers travel, accommodation and the practical side.

List only what would stop the set — a rider naming two essentials gets read, one naming twenty gets skimmed.

EPK

An EPK is an electronic press kit — a single page or file holding a DJ's bio, photos, mixes, links and contact details, sent to promoters and press instead of a scattered set of messages.

A promoter wants a mix, a photo and a line to paste — anything they have to ask for is friction.

Handover

A handover is the moment one DJ stops and the next starts — the logistics of it, not the mix. Sticks come out, headphones swap, someone finds a channel, and the room hears whatever happens while that goes on.

Load into a spare player before the outgoing DJ needs the deck. A good handover is one nobody in the room notices.

Curfew

A curfew is the time by which amplified sound must stop, set by the venue’s licence or a local authority. It is not negotiable on the night, and overrunning it can cost the venue its ability to open at all.

Plan the last twenty minutes backwards from the curfew, and finish a minute early rather than a minute late.

Sound limiter

A sound limiter is a device wired into a venue’s power or signal that measures level in the room and cuts the sound when it exceeds a set threshold. It is a licence condition, not an audio tool.

A limiter cuts, it does not turn down. Keep the average below the light and let the peaks do the work.

Guest list

A guest list is the names a DJ may add for free entry, agreed with the promoter and usually capped at a small number. It is part of the booking rather than a favour, and it has a deadline.

Ask for the number you actually need when the fee is agreed, then send the names before the deadline they gave you.

Door split

A door split pays a DJ a share of ticket income rather than a fixed fee. The share is usually taken after the promoter’s costs, which is the term that decides whether the deal is generous or worthless.

Ask what comes out before your share and ask to see the door count. A split with undefined costs is not a number.

Booking fee

A booking fee is the agreed amount a DJ is paid to play, independent of how the night performs. It is sometimes called a guarantee, because that is exactly what distinguishes it from a share of the door.

Agree the fee, then agree what it does not include. Travel and a buyout move the real number more than the fee does.

Deposit

A deposit is part of the fee paid before the event, typically on signature or a set number of days ahead. It converts an intention into a commitment, and it is usually non-refundable if the promoter cancels.

A deposit is a seriousness test as much as a payment. A promoter who will not pay one is telling you something.

Advance

Advancing a show is the exchange of practical information between artist and promoter in the days before it — times, equipment, travel, contacts. The document that results is usually called an advance sheet or day sheet.

Send the advance a week out and put the answers on one page you can read on a phone in a taxi.

Per diem

A per diem is a fixed daily cash allowance for food and incidentals while travelling, paid separately from the fee. It is normal on multi-day trips and tours and unusual on a single local booking.

Ask about a per diem when a booking involves a night away. It is normal on travel dates and never offered unprompted.

Buyout

A buyout is cash paid instead of providing something the rider asked for — usually the hospitality items, sometimes a meal or accommodation. Both sides often prefer it, because cash is easier than shopping.

Take the buyout for hospitality and take the real thing for food. Cash does not help at two in the morning.

Radius clause

A radius clause restricts a DJ from playing within a given distance of a booking for a period either side of it. Festivals use them heavily; a typical shape is a set number of miles and a window of weeks.

Check the radius and the window against your diary before you sign, not after the next offer arrives.

Booking agent

A booking agent sells your live dates: they take offers, negotiate fees and terms, advance shows and chase payment, for a commission on the fee — commonly around ten to fifteen per cent of it.

Agents convert demand rather than create it. Get asked for first; the right time to sign is when you are turning work down.

Manager

A manager works across an artist’s whole career rather than a single revenue line — releases, strategy, team, partnerships and the day-to-day — usually for a percentage of overall income rather than of live fees alone.

A manager takes a share of everything, so the deal you sign early is the one that costs most later.

Accreditation

Accreditation is the pass system controlling who may go where on a site — laminates, wristbands and colour codes, each granting a defined set of areas. It is issued on arrival against a list submitted in advance.

Send names to accreditation by the deadline. Nobody at a gate can upgrade a pass, however reasonable the reason.

Artist liaison

An artist liaison looks after performers on the day: meeting you, getting you accredited, showing you where the stage is, handling the rider, and making sure you are in the right place at the right time.

Get the liaison’s number in the advance and use it. They are employed to solve exactly the problem you are having.

Stage manager

A stage manager runs one stage: the running order, the changeovers, who is on it and when they get off. On the day, their word about timing is final regardless of what a contract says.

The stage manager owns the clock on the day. End when they ask and you will be the act they protect next time.

FOH engineer

The front-of-house engineer is responsible for what the audience hears. They control the system, its processing and its level, from a position out in the room rather than in the booth.

The engineer hears the room and you hear the booth. When they say the bass is heavy, they are right.

Monitor engineer

A monitor engineer is responsible for what the performer hears rather than what the audience hears, mixing the booth wedges or in-ears from a separate desk. The role is common at festivals and rare in clubs.

At a festival, the monitor engineer owns your wedge. At a club, that job is the booth knob and it is yours.

Load-in

Load-in is the window during which artists and crew may bring equipment into a venue, at a specified door and time. It exists because a building has one goods entrance and a schedule for everyone using it.

Ask for load-in time and door in the advance, and use it to see the booth while the room is still quiet.

Copyright

A recorded track carries at least two separate copyrights: one in the composition — the notes and words — and one in the specific recording. They are frequently owned by different people, and both apply at once.

Two copyrights, usually two owners: the composition and the recording. Almost every rights question starts here.

PRS

PRS for Music is a UK collecting society that licenses the public performance of compositions and distributes the money to writers and publishers. Venues hold the licence; the DJ playing there does not need one.

In the UK the venue holds the licence, not the DJ. If you write music, this is also how you get paid.

Royalties

Royalties are payments to rights holders for the use of music. Different uses generate different kinds — public performance, broadcast, streaming, reproduction — and each flows through its own system to a different set of people.

Playing records generates royalties for other people through the venue’s licence. Producing is what puts you on the other side.

Mix licensing

A recorded DJ mix contains other people’s recordings and compositions, so putting it online is a use that needs permission. Some platforms hold blanket licences covering it; others do not, and the difference decides what happens.

The platform’s licence decides what happens to a mix, not a disclaimer and not a tracklist in the description.

DMCA

The DMCA is US legislation that gives platforms protection from liability if they remove material when a rights holder notifies them. In practice it is the mechanism behind takedown notices on most large services.

Takedown first, argument later. That order is the design rather than a failure, and it is why removal feels instant.

Content ID

Content ID is an automated system that fingerprints uploaded audio and matches it against a database of registered recordings. On a match, the rights holder’s pre-set policy applies — block, track, or monetise.

Content ID matches fingerprints and applies a policy somebody set in advance. It does not judge anything.

Label demo

A demo is unreleased music sent to a label for consideration. Most labels state how they want it — a private streaming link, one or two tracks, a short message — and most ignore anything sent another way.

One or two tracks, a private link, and one sentence explaining why this label. Everything else is noise.

A&R

A&R — artists and repertoire — is the role at a label responsible for finding artists and shaping what they release. On a small label it is often the owner; on a large one it has a budget behind it.

A&R decide in seconds and shape releases for months. Make the first thirty seconds do the work.

Bedroom DJ

A bedroom DJ plays at home rather than in venues. It is a stage rather than a category — almost every working DJ was one, and plenty of very good DJs never stop being one by choice.

The technique develops at home; reading a room does not. That gap only closes in front of people.

Club DJ

A club DJ plays extended sets in nightclubs, usually within a genre and usually to a crowd who came for the night rather than for a specific song. The format rewards patience over immediacy.

Long sets reward shape over highlights. Two hours cannot be a run of big records and should not try.

Touring DJ

A touring DJ plays regularly in cities other than their own, usually through an agent, with travel and accommodation part of the booking. The mixing is a small fraction of the job.

The mixing is the small part. Sleep, logistics and a stick that works anywhere are most of the job.

Turntablist

A turntablist treats the turntable as an instrument rather than a playback device — scratching, juggling and composing routines. The discipline overlaps with DJing and is not the same job.

The turntable as an instrument. A club DJ works to be invisible; a turntablist works to be watched.

Selector

A selector chooses records and lets them play, with little or no blending. The term comes from Jamaican sound-system culture and now describes anyone whose value is entirely in what they play.

Choosing over blending, on purpose. A DJ who mixes flawlessly and chooses badly is the worse of the two.

Controllerist

A controllerist performs with a controller as an instrument — pads, loops, effects and samples triggered live — rather than using it to play two tracks. The output is closer to a live remix than to a mix.

A controller as an instrument rather than two decks. The difficulty is real and largely invisible in a room.

Producer DJ

A producer DJ is booked primarily for the records they made rather than for how they play. The set is expected to include their own music, and the audience came for the catalogue.

Booked for the records, not the set. The audience came to hear specific tracks, so play them.

Live PA

A live PA is a performance where the music is played or built rather than mixed from finished records — hardware, software instruments, or a hybrid. It is a different booking with different technical needs.

Played rather than mixed. It needs setup time and inputs, and the DJ after it starts from silence.

Hybrid set

A hybrid set mixes records in the ordinary way while adding live elements — a drum machine, a synth, vocals, or stems triggered alongside. It sits between a DJ set and a live PA.

Records underneath, one live element on top. The records mean a failure is an absence rather than a disaster.

Support act

A support act plays before the headliner, building the room toward them. The job is explicitly not to peak — it is to leave the room warmer and more populated than it was, and ready for someone else.

Leave the room warmer and ready for someone else. An opener who peaks has spent energy that was not theirs.

Crew

A crew or collective is a group of DJs who play, promote and release together under one name. It is the most common way a scene organises itself and the most reliable way for new DJs to get slots.

A collective is a credential none of its members has alone. It is also the fastest way to learn.

MC

An MC works the microphone over a DJ set — hyping the crowd, introducing records, and in some genres performing lyrics over the music. In others the role is closer to a host who speaks rarely.

A voice lives in the mids, so a set with an MC needs mid space. In some genres they are the music, in others an intrusion.

VJ

A VJ performs visuals live alongside a DJ or band — mixing video, generative graphics and lighting cues in time with the music. It is a parallel performance rather than a backdrop.

A parallel performance, not a backdrop. Tell them what is coming and they can land it with you.

Mobile DJ

A mobile DJ brings their own sound, lighting and equipment to venues that have none — parties, corporate events, functions. The music is only part of what is being booked.

You are the sound system as well as the DJ. Power, cabling and a spare of everything are part of the job.

Wedding DJ

A wedding DJ runs the music for a reception — often also handling announcements, the first dance and the schedule. The brief is a room of every age with no shared taste and one night that cannot be repeated.

Every age, no shared taste, one night that cannot be repeated. Reliability matters more than taste.