Comment #20 on issue 2823 by [email protected]: Patch: Fixes position of
mensural c clef
http://code.google.com/p/lilypond/issues/detail?id=2823
Hi all,
the manuscript that David mentioned that I was referring to is indeed in
the *old* MGG, vol. 9, table 94, near column #1650. It contains a clef
consisting of really *three* breve-like heads. There is a "b" accidental
aligned with the middle breve. This situation occurs on two lines, so I am
pretty sure this is not a mistake of the manuscript author. In other
words, the three breve-like heads are aligned with the g, h and d staff
lines. From that point of view, maybe this clef should be considered as a
G clef rather than a C clef, as the three breve-like heads effectively
constitute a G major or minor "chord" (yes, of course I know that "chords"
in the modern sense appear only some centuries later...).
The referred manuscript depicts the Ockeghem's "Missa Prolationum" from the
Chigi Codex (Ms. Chigi C VIII 234, fol. 106v-107). The manuscript dates
from around 1500 (see http://en.wikipedia.org/wiki/Chigi_codex). Note that
this piece of music is *very* special (see
http://en.wikipedia.org/wiki/Missa_prolationum), and maybe this piece just
also uses a very special clef.
By the way, if you want to change the musical meaning of the clef (i.e. the
pitch that is in the center of the clef), you should not change the glyph,
but the clef's properties in parser-clef.scm (in particular, the definition
of c0-pitch-alist).
Hope that helps,
Jürgen
