Le lundi 27 mars 2023 à 23:08 +0100, Paul Hodges a écrit : > I have been asked to take a piece of music (which I already have in > LilyPond), and mirror it vertically. That's to say, to take each note which > is n semitones above middle c and replace it with the note n semitones below > middle c, and vice versa. > Before I start trying to write a function to do this, I thought I'd ask if > anyone has or is aware of a snippet which can already do this?
See https://lilypond.org/doc/v2.24/Documentation/notation/changing-multiple-pitches#inversion
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