Few days ago I asked how to get the number of beats and the duration of each beat of a measure.
The reason was that I wanted to try to write some facilities to add a ticktock measure at the beginning of a score: My idea was to transform a score like this \version "2.19.81" music = {\time 3/4 a b c'} \score { \new Staff \music \layout {} \midi {} } [image: image.png] to something like this \version "2.19.81" music = {\time 3/4 a b c'} myRests = {\time 3/4 r4 r r} ticktock = \drummode {\time 3/4 hihat bassdrum bassdrum} \score { << \new Staff {\myRests \music} \new DrumStaff { \ticktock} >> \layout {} \midi {} } [image: image.png] For this I thought to write a substitution function etc. Something like this (it doesn't compile): \version "2.19.81" myScore = #(define-void-function (music) (ly:music?) (let (myRests #{ \time 3/4 r4 r r #} ) (ticktock #{ \time 3/4 hihat bassdrum bassdrum #})) #{ \score { << \new Staff {\myRests $music} \new DrumStaff { \ticktock} >> \layout{} \midi{} } #}) music = {\time 3/4 a b c'} \myScore \music The "let" part is not correct. I don't know how to define variable containing lilypond code using let. So any suggestion is appreciated. And of course the function should create a myRests and ticktock of the right length according to the $music contents. Any help is appreciate. Thank you, g.
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