Re: [Lilypond-auto] Issue 2823 in lilypond: Patch: Fixes position of mensural c clef

[lilypond]

Comment #20 on issue 2823 by address@hidden: 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