Description:
Returns a key function for sorting a list of chords based on
the angles measured from the progression vector of the pair
(REF-FROM REF-TO) to the progression vector of the pair
(FROM-CHORD <c>), where each chord in the list takes the
place of <c>. 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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