Description:
Returns a key function for sorting a list of chords based on a
weighted sum of the positions in the progression vector from
FROM-CHORD to each chord in the list. Progression vectors are
calculated for the intervals represented in CLASSREPS, which
should be a list of PROG-CLASSREP expressions with special
syntax. For more information, see PARSE-PROG-CLASSREPS
and its documentation.
The modulus of the pitch class space defaults to 12 but can
be set to other values via the optional parameter N.
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