Hi Michael, some time ago I created a function for exactly that for a stackexchange question: https://music.stackexchange.com/questions/127175/lilypond-transpose-a-sequence-to-modes-with-different-intervallic-structure
Essentially it introduces a function to map one scale to another, and it does
so by basepitch to retain alteration. One could easily adapt this function to
match by base pitch and alteration:
transposePitchClasses =
#(define-music-function (scaleA scaleB music) (ly:music? ly:music? ly:music?)
(let* ((scaleA (ly:music-property scaleA 'elements))
(scaleB (ly:music-property scaleB 'elements))
(scaleA (map (lambda (x) (ly:music-property x 'pitch)) scaleA))
(scaleB (map (lambda (x) (ly:music-property x 'pitch)) scaleB))
(classesA (map (lambda (p) (cons (ly:pitch-notename p) (ly:pitch-
alteration p))) scaleA)))
(map-some-music
(lambda (m)
(let ((p (ly:music-property m 'pitch)))
(if (not (null? p))
(let* ((nn (ly:pitch-notename p))
(oct (ly:pitch-octave p))
(alt (ly:pitch-alteration p))
(pos (list-index (lambda (x) (and (= (car x) nn) (= (cdr x)
alt))) classesA)))
(if pos
(let* ((p2 (list-ref scaleA pos))
(oct2 (ly:pitch-octave p2))
(p3 (list-ref scaleB pos))
(new-pitch (ly:pitch-transpose p3 (ly:make-pitch (-
oct oct2) 0))))
(ly:music-set-property! m 'pitch new-pitch)))
m)
#f)))
music)
music))
\transposePitchClasses {d fih g aih} {dih f gis a}
{ c' cis' d' dis' f' fih' fis' g' a' aih' }
Am Donnerstag, 31. August 2023, 12:53:26 CEST schrieb Michael Winter via
LilyPond user discussion:
> I would like to do something (hopefully simple), which is basically a custom
> find and replace for a set of notes in an entire score.
>
> For example {c cis d dis fih g aih} -> {c cis dih dis f gis a}
>
> So basically on arbitrary list of pitches / scale to another.
>
> Is this possible without writing a custom function. If not, any hints on how
> to tackle the problem would be much appreciated. Thanks in advance.
>
> -Michael
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