[CM] Parsing symbolic note names

[bil at ccrma.Stanford.EDU]

cmn predefined all the notenames like c5 as variables:
cmn2.lisp line 1598.  I wanted to write staff note info
as (treble c5 e) or the like (i.e. avoiding quoting
everything), and taking advantage of CL's split between
the function name (treble-as-a-function) and a variable
name (treble-as-just-a-variable).  Since Scheme is a
Lisp-1, this won't work in s7.