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Transposition Function Needed

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Dear All, 

I think there is a much needed basic function in Opusmodus:

a function to perform diatonic transposition, like


(pitch-transpose-to-set (1) '(c4 d4 e4) :set '(c4 major))

result: (d4 e4 f4)

(pitch-transpose-to-set (2) '(c4 d4 e4) :set '(c4 major))

result: (e4 f4 g4)

(pitch-transpose-to-set (1) '(c4 d4 e4) :set '(d4 major))

result: (cs4 e4 fs4)

(pitch-transpose-to-set (2) '(c4 d4 e4) :set '(cs4 whole-tone) :round up)

result: (cs4 ds4 f4)


It could be also have the possibility of being octave independent in relation to the set, like


(pitch-transpose-to-set (1) '(c2 d6 e5) :set '(c4 major) :octave-free t)

result: (d2 e6 f5)


Actually, the diatonic transposition (or transposition by any other set) is a more sophisticated thing than the simple transposition.


And I think that is an essential function for music.


I know that is possible to make it via tonality-map but I miss a more easier way to apply the idea over existing material.


Best !


P.S. If this function already exist, please let me know.


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