Re: [LSR v2.18] "Normalized \transposition" does not compile

[David Kastrup]

Pierre Perol-Schneider <address@hidden> writes:

> Dear Squad,
>
> The following snippet :
> http://lsr.dsi.unimi.it/LSR/Item?id=697
> Does not compile after a v.218 nor v2.16 upgrade.
> Originally made by Jay Anderson (see.
> http://lists.gnu.org/archive/html/lilypond-user/2008-06/msg00426.html)
> Last try for updating by Kieren MacMillan (see.
> http://lists.gnu.org/archive/html/lilypond-user/2013-01/msg00749.html)
>
> Terminal says :
> .../all/normalized--transposition.ly'
> .../all/normalized--transposition.ly:22:40: In procedure car in expression
> (car (ly:music-property key #)):
> .../all/normalized--transposition.ly:22:40: Wrong type (expecting pair): ()

Well, here is a working adaption:

%LSR contributed by Jay Anderson 
http://lists.gnu.org/archive/html/lilypond-user/2008-06/msg00426.html

#(define (adjust-note mus key currkey)
 (cond ((eq? (ly:music-property mus 'name) 'NoteEvent)
         (ly:music-transpose mus (car currkey)))
       ((and
          (eq? (ly:music-property mus 'name) 'PropertySet)
          (eq? (ly:music-property mus 'symbol) 'instrumentTransposition))
         (set-car! currkey (ly:music-property mus 'value))
         (ly:music-set-property! mus 'value (ly:make-pitch 0 0 0))
         mus)
       (else mus)))

normalizeTransposition =
#(define-music-function (parser location key music) (ly:pitch? ly:music?)
 (ly:music-transpose
   (let ((currkey (list (ly:make-pitch 0 0 0))))
     (music-map (lambda (x) (adjust-note x key currkey)) music))
   (ly:pitch-negate key)))

music = \relative c' {
 \time 4/4
 \transposition f
 c e g c |
 \transposition ees
 c, e g c |
 \transposition d
 c, e g c |
}

\score {
 <<
   \new Staff {
     \music
   }
   \new Staff {
     \normalizeTransposition f \music
   }
 >>
 \layout {}
 \midi {}
}

But it might be worth just using quoted music for that: it automatically
transforms itself into concert pitch.

-- 
David Kastrup