Comment #1 on issue 1034 by n.puttock: Documentation: categorizing
music-function docstrings
http://code.google.com/p/lilypond/issues/detail?id=1034
IIUC, there are only three reasons for using music functions (unrelated to
the
convenience of automatic docstrings):
1) The command takes arguments (the majority of course :)
2) The command can be invoked at toplevel as well as in music (e.g.,
\pageBreak)
3) The command does something unrelated to music, but uses a void function
to prevent
scheme evaluation by the parser (e.g., \pointAndClickOn)
In the case of \breathe, it shouldn't be in music-functions-init.ly since
it would
work perfectly well as an identifier.
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