Description:
Prints a description of each item in a list of prog-classrep expressions,
to assist in the construction of parameters that use this format. This
function returns the input list, so it can be used 'inline'.
PROG-CLASSREP EXPRESSION SYNTAX
1. directed pc interval, possibly 0; or aggregation of them
-- mod-N integer; or list of them
2. directed pitch interval or range of them; or aggregation
of intervals and/or ranges
-- (:p a-0 a-1 ...)
a-i a nonnegative integer or pair (LO-i HI-i) representing the range
[LO-i, HI-i]; a single interval or range takes the same form, and is
therefore a list with head :p and tail of length 1
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