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Polyrhythms in dance music are an amazingly simple way of adding complexity to your tracks. Dance music theory expert Oliver Curry deconstructs two classic examples and shows how to use them in your own music.
In this edition of Passing Notes, we’re going to take a look at polyrhythms. A polyrhythm is the use of two or more simultaneous rhythms in different time signatures. As we’ll see, these rhythmic contrasts can be incorporated into any elements of a track. We’ll take a look at examples from Aphex Twin and Zomby – two of the finest exponents of polyrhythms – see how they can also work in house and techno, then construct an example from scratch.
A fantastic reference point for the concept of polyrhythms is Richard D. James’s track ‘Windowlicker’ which, alongside incredible sound design and production, subtly uses simultaneous contrasting rhythms to create its characteristic laid-back feel.
Without undertaking the near-impossible task of recreating the sounds of the original, we can use basic examples to look at a couple of key rhythmic components to the track and see how they combine to such an effective result.
The kick, snare and synth patterns that start at 0:51 are in a straight 4/4 rhythm, as we can hear replicated in the first four bars of the audio below. However, the quiet offbeat hi-hats that come in during the second four bars of the sample are in a 6/8. In this very stripped down recreation, we can hear how a hi-hat rhythm in 6/8 can affect the feel of the piece in 4/4:
Here, the hi-hats are highlighted in red, the kick in yellow and the snares in blue. By setting the piano-roll grid to 48th notes, we can read our sequencer in both 6/8 and 4/4 easily. (Every three 48ths will give you 16ths, thus keeping the part in 4/4. Every four 48ths is a 12th, which will divide the beats into 3rds. If you’re scratching your head, don’t worry – the important point to remember is that both 6/8 and 4/4 fall perfectly on the gridlines with the grid divisions set to 48ths .)
There are numerous other elements to ‘Windowlicker’ that also use this contrast of rhythms. The main vocal melodies, for example, are also in a 6/8 time signature, whilst subtle drum loops roll underneath on the 16ths, very low in the mix.
One Foot Ahead Of The Other
Let’s look now at Zomby’s track ‘Helter Skelter’, from 2009′s One Foot Ahead Of The Other EP
In particular, we’re looking at the section starting at 0:13. The drum loop, colour-coded as before, with the hi-hats red, snare in blue, kick in yellow, looks like this:
We can see that all the drum hits in this loop, land on 16th (again, every third 48th is a 16th, every fourth 48th is a 12th). However, if we look at the sawtooth bass line, sequenced below, we can see that it’s in 6/8, with each note landing on a 12th of the piano roll.
And here’s how the two contrasting time signatures sound together:
For a direct comparison of the effect this polyrhythm has on the sound, let’s compare the same loop without a polyrhythm. Here’s the result if we quantise the drums to 6/8 time to match the bass:
Without the polyrhythm, the loop is much more predictable and lacks its distinctive character. Other similar examples of polyrhythm can be throughout the track ‘Bubble Bubble’ from the same EP.
Next, let’s have a listen to how polyrhythms can be applied to tracks which follow more traditional house and techno approaches…
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