[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] #4702 Add conversion function creator make-semitone->pitch

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[issues:#4702] Add conversion function creator make-semitone->pitch

Status: Started
Created: Sat Dec 19, 2015 08:39 PM UTC by David Kastrup
Last Updated: Tue Dec 22, 2015 08:51 AM UTC
Owner: David Kastrup

Add conversion function creator make-semitone->pitch

Also contains a function shift-semitone->pitch for moving a given
conversion function to a different key.

The functions work on semitones rather than the whole tones that
LilyPond uses in the accidentals of its pitches since the semitones
are the more natural basis for most applications (including
Midi-related work) as well as for humans: 6 whole notes per octave
sounds a lot less common than 12 semitones.

There are currently no uses of those functions: they are provided as a
convenience.

Additional commit:

Implement `music-pitches' function

http://codereview.appspot.com/283890043

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