Tempo & rhythm
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.
Measured in our catalog
At 128 BPM — the catalog's busiest tempo, 35,264 tracks — a beat lasts 0.47 seconds, so a bar is 1.88 and a 32-bar phrase is 60.0.
Every number a DJ counts in comes off that one figure. It is also why the counting survives a tempo change: raise the tempo and each beat gets shorter, but four of them still make a bar and thirty-two bars still make a phrase, so the structure you are counting into never moves.
Measured on 11 August 2026 across public tracks with a detected BPM, bucketed by round(bpm). Method: how we correct half-time BPM detection.
Why it matters
The beat is the smallest thing two records have to agree on. Everything else in a mix — bars, phrases, when the bass swaps, where the vocal lands — is built by counting beats, and a pair that disagrees at this level cannot be rescued by anything you do further up.
It is also the unit your ears check fastest. A DJ hears a beat drifting long before they can name which track is early, which is why beatmatching is taught as a listening skill rather than an arithmetic one.
Frequently asked
How many beats are in a bar?+
Four, in the 4/4 time signature nearly all dance music uses. That is what the "4/4" means — four quarter-note beats per bar.
How long is one beat?+
Sixty divided by the tempo. At 120 BPM a beat is exactly half a second; at 128 it is 0.47 seconds; at 174 it is 0.34.
What is the difference between a beat and a bar?+
A beat is one pulse; a bar is four of them. DJs count in bars because a bar is the same amount of music at any tempo, which makes phrasing portable across a set.
Related terms
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.
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.
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.
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.
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