Tempo & rhythm
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.
In practice
Two subdivisions at once, resolving every few beats. It is why minimal techno moves without changing.
Count the cycle before you loop a polyrhythmic section: three-against-four resolves every twelve beats, so a four-beat loop catches a different part of the pattern each time and an eight-beat one is worse. Take the loop at the resolution point or take a full phrase. When layering, put the polyrhythm on top of something straight rather than underneath it, so the ear has a steady reference to hear it against.
3:4
The classic ratio
12
Beats to resolve it
On top
Where to layer it
Where these come from: Rhythmic arithmetic and layering practice, not a catalog figure. For what we can measure, see the move it suits.
Why it matters
It is the technique behind most of what people call "hypnotic" in techno and minimal. A percussion line cycling every three beats over a four-beat kick takes twelve beats to repeat, so the groove keeps presenting itself differently while nothing about it actually changes.
For mixing, a polyrhythmic record is a long-blend problem and a layering opportunity at the same time. Its cycle is longer than a bar, so a four-bar loop of it can land somewhere unintended — but layered under a simple track it adds movement that neither record had alone.
Frequently asked
Is a polyrhythm the same as syncopation?+
No. Syncopation accents unexpected places inside one subdivision; a polyrhythm runs two different subdivisions simultaneously.
How do I loop a polyrhythmic section?+
At the point the patterns resolve, or across a full phrase. A four-beat loop of a three-against-four pattern catches a different part of the cycle every pass.
Why does minimal techno sound hypnotic?+
Often this — a percussion cycle of a different length from the kick, so the combination keeps presenting a new face while nothing in the arrangement changes.
Related terms
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.
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.
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.
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.
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