My Method and Approach to Polyrhythms

Explaining Benevolent’s songs ‘Purgatory’ & ‘The Quantum Paradox’ 

So I wanted to write his one up for a while, the songs ‘Purgatory’ and ‘The Quantum Paradox’ off of Benevolent’s debut EP ‘Divided’ have a few of my favorite moments to play live, and those are the polyrhythmic bits where there’s an oscillation of two beats on top of each other (which is what a polyrhythmic beat is) and resolving together towards the end of the overall pattern. 

So let’s start with the basics, what does the term polyrhythm mean? 


A polyrhythm is when you have more than one rhythm on top of each other being played simultaneously. Though lots of instruments can contribute to a polyrhythm, the drums are what really set it apart and put it to the groove. Commonly in metal, you’d find drummers following the guitar pattern with the kick drum, that oscillating around straightforward cymbal work and with the snares sitting on regular 4/4 patterns. 

Let’s get into how those this was utilized in the songs PURGATORY and THE QUANTUM PARADOX; 

Purgatory 


The song Purgatory’s polyrhythm section takes place at 00:27, and is based on a very simple pattern in 10/16 (or 5/8) looping (or oscillating) over a 4/4 measure. The pattern is as follows: 

Notes explanation:

TWO 16th – ONE 16th REST – TWO 16th – ONE 16th REST – THREE 16th – ONE 16th REST

In simple, 2/2/3 (add a rest in between each note)

TIP:

How did I know it is a 10/16?

SIMPLE: We’re playing 16th notes over bpm 160. SO let’s count the number of notes based on that little breakdown I added up:

2 + 1 + 2 + 1 + 3 + 1 = 10

As you can see, the pattern on takes up 10/16 of a 4/4 beat.

So, what creates that cool groovy poly sound?

It’s pretty simple, in a complicated way; basically if the drums were playing a 5/8 beat over the 5/8 pattern then the entire band would be doing the same exact rhythm and that is no longer considered a polyrhythm. The simple fact that the drummer is entertaining a 4/4 feel to the rhythm is exactly what is creating this cool groove, is the rotation of the pattern around the simple 4/4 feel that’s giving it that really interesting mathematical sound.

Note that the pattern is broken up and both drums and guitars are in a synchronized rhythm at the 3rd beat of the 8th bar.

The entire pattern:

The Quantum Paradox

The polyrhythm in the song The Quantum Paradox takes place at 01:26, this one’s based on a little more complicated pattern (And a longer one); pattern is:


Notes Explanation:

THREE 16TH NOTES + ONE 16TH REST + TWO 16TH NOTES + ONE 16TH REST + TWO 16TH NOTES + ONE 16TH REST + FIVE 16TH NOTES + ONE 16TH REST + TWO 16TH NOTES + ONE 16TH REST + TWO 16TH NOTES + ONE 16TH REST

In simple, 3/2/2/5/2/2 (add a rest in between each note)

As you can see, this pattern is in 11/8 (or 22/16).

TIP:

How did I know it is a 22/16?

SIMPLE: We’re playing 16th notes over bpm 160. SO let’s count the number of notes based on that little breakdown I added up:

3 + 1 + 2 + 1 + 2 + 1 + 5 + 1 + 2 + 1 + 2 + 1 = 22

The pattern of 22/16 is, just as in Purgatory, looping and revolving around a 4/4 beat with the cymbals and snares falling exactly where an average-Joe beat would be like!

As explained in the Purgatory example, the oscillation of the two rhythms over each other is resulting in a very interesting mathematical groove.

Note that the pattern is broken and a “resolving” riff is introduced at the 8th bar as to give an indication of the end of this section and the beginning of the next in a more audible sense. (This is good news for us live as well since it allows us to be able to feel when to switch to the next bit together without the need of an accountant on stage) 

The entire pattern:

So, yea

Finally, I hope that this was a helpful little lesson! Hit me up if you’ve got any questions or comments!

I’ll do another piece in the near future on where you can draw inspiration for interesting polyrhythm ideas without overdoing the same feel or repeating your good old ideas.

Hadi