-Since the design goals of both LilyPond and MusiCopy were roughly the
-same, both systems have superficial similarities: the details of the
-input format, the notation of "musical state". However, LilyPond
-stresses extensibility, modularity and separation between content and
-presentation much more, and this shows: LilyPond is more flexible. To
-be fair: development of MusiCopy was abandoned in 1987, so it is not
-surprising that LilyPond is more mature.