Tempo & rhythm
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.
Measured in our catalog
At 128 BPM — the catalog's busiest tempo, 35,264 tracks — one bar lasts 1.88 seconds, so the median track at 5:48 runs about 186 bars.
443,442 of 443,460 public tracks are in 4/4, so that arithmetic holds almost everywhere in the catalog. The exceptions number in the dozens, not the thousands.
1.88 s
One bar at 128
186
Bars in a median track
5:48
Median track length
99.996%
Of the catalog is 4/4
| Tempo | Tracks | One bar | 8 bars | 16 bars |
|---|---|---|---|---|
| 128 BPM | 35,264 | 1.88 s | 15.0 s | 30.0 s |
| 124 BPM | 30,979 | 1.94 s | 15.5 s | 31.0 s |
| 125 BPM | 28,309 | 1.92 s | 15.4 s | 30.7 s |
| 126 BPM | 27,156 | 1.90 s | 15.2 s | 30.5 s |
Measured on 11 August 2026 across public tracks with a detected BPM for the tempo counts; public tracks with a duration for the median length.
Why it matters
Everything about a transition is measured in bars: how long the intro runs, when the bass swaps, how many bars of overlap you have before the outgoing track ends. Counting in seconds forces you to redo the arithmetic every time the tempo changes.
Bars are also why 4/4 is worth knowing about. In a signature where every bar is the same size, two tracks stay aligned for as long as you leave them running.
Frequently asked
How many beats are in a bar?+
Four, in 4/4 time, which is what virtually all electronic dance music uses. A handful of tracks in this catalog are in 3/4 or 5/4 — under twenty of them across 443,000.
How long is a bar at 128 BPM?+
1.88 seconds. Four beats at 128 BPM is 4 × 60 ÷ 128, and the same arithmetic gives 1.94 seconds at 124 and 1.71 at 140.
Why do DJs count in bars instead of seconds?+
Because music is built in bars. A 32-bar intro is 32 bars whether the track runs at 122 or 140; in seconds it is a different number every time, and none of them line up with where the track actually changes.
Related terms
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.
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.
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.
Explore: Beats-to-time calculator · 128 BPM tracks · All DJ terms