Re: polymetics in piano

[Trevor Daniels]

Mark Stephen Mrotek wrote Saturday, August 31, 2013 2:06 AM

> In a previous thread
> (http://lists.gnu.org/archive/html/lilypond-user/2013-08/msg00673.html), a
> Chopin Nocturne was discussed that has polymetrics starting on the second
> page of the score.  I have looked at the .ly file (attached) and have a
> minimal understanding of the "\set Timing.measureLength = #(ly:make-moment 4
> 8)" command. Where in the manual can I find a detailed explanation -
> especially the role of the two numbers?
> 
> My particular goal is to write one 9/4 measure against three 3/4 measures. 

There is an example showing the changes needed to set polymetric music
of the type you describe towards the end of this section of the Notation 
Reference:

http://www.lilypond.org/doc/v2.17/Documentation/notation/modifying-context-plug_002dins

I think that shows all you need to write a 9/4 measure against three
3/4 measures.  But the main section on polymetric notation showing more
complex arrangements is here:

http://www.lilypond.org/doc/v2.17/Documentation/notation/displaying-rhythms#polymetric-notation

which explains all you need to know (I hope!)

Trevor