A polyrhythm is two different rhythmic divisions layered at the same time over the same span. In the classic three-against-two, one part plays two groupings while the other plays three within the same length.
The basic idea
The two rhythms pass through different positions along the way, but they line up again at the end of the agreed span. This offset and reunion produces a complex, three-dimensional rhythm.
Its role in writing and performing
Layering it on percussion, hi-hats, arpeggios or bass adds movement to simple repetition. Rather than making everything complex, leaving one steady part helps the listener keep hold of the beat.
How to try it in your DAW
Start with a kick dividing one bar in two, then place a clap or a note that sounds three times over the same length. Zooming the grid in and seeing where they land together makes it easier to understand.
How it differs from related terms
A polyrhythm layers different divisions at the same time, while an odd meter changes the grouping of beats in the bar itself. Both create complex rhythms, but the mechanisms differ.
Start by looping a short figure like three-against-two and feeling the beat in your body as you build.
