Comment #30 on issue 2823 by [email protected]: Patch: Fixes position of mensural c clef
http://code.google.com/p/lilypond/issues/detail?id=2823
that's really funny and shows how nonchalant mensural notation can be. both parts should be read with one b signature, even though formally the signature for the part reading tenor clef it looks like a "one des signature". note that the upper part(s) (that/those with the combined soprano-mezzosoprano clef) has/have no signature, see the Vienna version. Phil (or anyone else), do you still need the scans?
