Interesting. I had not seen this before, but a quick Google search
suggests that it is not unknown for chant to be printed in black and
red. Just for reference, it seems that, based on the documentation,
this was changed in Lilypond between 2.4 and 2.6.
Thanks,
Joe
On 27/03/07, Mats Bengtsson
I don't really know anything about gregorian chant notation, but if you
refer to
section 7.7.11 Gregorian chant contexts, it mentions "Editio Vaticana"
and I guess that the inspiration to use colored staves comes either from
that edition
or from original manuscripts.
If you want them in black,
