The # switches from LilyPond to Scheme.  This means that once you are in Scheme 
you don't need it again.

#(colorNote #offset)  

should read

#(colorNote offset) 


Am 20. September 2016 19:12:26 MESZ, schrieb PMA <>:
>Hi Lilypond Gurus!
>I need help, when you can spare the time, to get an already-
>working Lilypond music function to call my just-added Scheme
>This Scheme procedure works when called directly from Guile:
>entering "(colorNote -1)" get output "red".
>(define (colorNote n)
>   (cond ((eq? (- n) 1) 'red )
>         ((eq? (- n) 2) 'blue)))
>But in trying to evoke the procedure, the following Lilypond
>function hits two snags: it apparently doesn't see colorNote
>at all, and even if it did, it still would not convert the
>returned "red" to "#red".  (I've omitted irrelevant lines.)
>FS =
>#(define-music-function (parser location offset) (number?)
>   #{
>     \override NoteHead.font-size = #offset  % This line works.
>    %\override NoteHead.color = #red         % This line worked.
>     \override NoteHead.color = #(colorNote #offset) % *ERRORS*.
>   #})
>I suspect that a fix here is easy.  But it's beyond my naive
>struggles.  I'd appreciate any suggestions.
>lilypond-user mailing list

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