Re: Polyrhythmic music

[Jean Abou Samra]

Le 27/10/2022 à 12:10, Paul Hodges a écrit :
> This is not (yet) a specific query, I'm afraid.  My new project is 
> going to push my usage of LilyPond way beyond what I've done up till 
> now.  I have already found solutions for a couple of new challenges, 
> and a partial solution to a third.
>
> But my main issue is polyrhythms.  There are two instruments, and some 
> of the time they play in sync, with the same barring, and barlines 
> which join across the system; then at other times they separate, and 
> may play a section at different speeds and barring, coming together 
> again later.  I know that I have to move the Timing_translator 
> engraver from Score context to Staff, but so far my searching has not 
> shown me how to work further with this.  How, for instance, do I 
> indicate the points at which the parts meet (within a polyrhythmic 
> section), and how to change between synchronised and polyrhythmic 
> sections?
>
> Does anyone have any hints, guidance, or experience which might help 
> get me started?  I have attached a bad scan of a couple of lines of 
> the MS to give an idea of what I'm facing.



For a start, have a look at the documentation:

https://lilypond.org/doc/v2.22/Documentation/notation/displaying-rhythms#polymetric-notation

Several techniques related to polyrhythms are explained there with 
examples, including moving Timing_translator and using \scaleDurations.

From the image you sent, I actually don't understand where the 
polyrhythms are, can you elaborate?

See attached for .ly code for the beginning of your excerpt (it gave me 
some busywork to relax…). As you can see, there are unsurprisingly lots 
of tweaks. I hope this gets you started for the rest.

Best,
Jean

Connolly Tesserae.ly
Description: Text Data

Connolly Tesserae.pdf
Description: Adobe PDF document