Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.9) Gecko/20020313
Well, I hope that the emacs mode will end up being able to fully cope
with multi line comments and multiline scheme.
When the mode is invoked (when a file is read or with M-x LilyPond-mode)
then all multi-line schemes and multi-line comments are correctly
parsed. But if you edit any of those - or create a new one - then the
colouring gets wrong.
As I said before this can be fixed (correctly recoloured) with M-x
LilyPond-mode - and until the bug is permanently fixed I would suggest
to add a simple hotkey which does this (a shortcut to M-x LilyPond-mode,
that is).