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LilyPond is a music typesetting system and markup language. The internal parts are written in lisp and the user interface is influenced by the TeX syntax. So, are questions about this system on-topic on any of StackExchange sites? And on which one?
Typical question:
How do I add a tie on seconda volta note in LilyPond?
LilyPond seems to have a small following at Musical Practice & Performance
I think you'd be surprised at just how many musicians use utilities like this to reproduce music.
There is also a few at SuperUser.
I think either site is fine. I'd start with Musical Practice & Performance, as it is much more specific to that crowd.
There's an argument to be made that - as they effectively contain code - LilyPond input files can become so inscrutable to anyone but programmers, that questions about them are (a) unlikely to find answers on Music.SE (or, to a lesser extent, SuperUser), and (b) on-topic as programming questions for Stack Overflow (though this is maybe a bit more controversial).
On the one hand, this is similar in principle to asking how to use a particularly complex GUI to achieve the same result, making the question purely about usage and so off-topic for SO.
On the other, you could argue that a non-programmer on Music.SE is much more likely to be using the GUI than LilyPond anyway, and - depending on the complexity of the required solution - not equipped to actually formulate an answer by writing code. It doesn't seem sensible to ask questions in "the right place", when they stand a better chance of being answered in "the slightly less right place".
Of course, we could just conclude that they're off-topic everywhere on SE at the moment, and so should be confined to the LilyPond mailing list, but that sounds overly dogmatic and inflexible to me.
It has been recommended by the LilyPond community that all questions should be posted to the LilyPond Users mailing-list. There you will get fast and competent help!
To post a single question please go to: http://news.gmane.org/gmane.comp.gnu.lilypond.general. Use the drop-down in the upper right corner. Please review the recent topics to avoid double posting.
For a more thorough searching of old threads you can use: http://lists.gnu.org/archive/html/lilypond-user/
If you like to get more involved you can also subscribe to the list.
Expanding on Frankston's answer (i.e. commentary that is too long to format as a comment):
I've always considered lilypond to be directly on topic for Musical Practice & Performance, given the indication that "usage of specific music software" is on topic. I'm certain that there are many users who are experience in how to read lay-out music notation in general, and there are a few who are using lilypond specifically.
I can see an argument that more complicated lilypond scripting, i.e. once users start to program in guile within their lilypond files, could be more of a Superuser or Stack Overflow type of question.
However, to date it looks like all of the questions are "how do I get lilypond to output what I want" (Music Practice) rather than "how do I do complicated programming within a lilypond file" (SuperUser), so I'd still say that the primary location for basic lilypond usage questions is Musical Practice & Performance.
As a final note, prompted by PeterBjuhr comments/answer, one of the reasons why there are so few questions is because lilypond has an active and helpful mailing list; and you're likely to get better answers there (at least for now).
