>> In some snippets I've seen a note "q" which appears to repeat the
>> previous note or chord. But I can't see it anywhere in the
>> documentation (and doing a search for "q" isn't likely to be much
>> help!). Is it there, or should it be?
> You could always look in the index. Except that it isn't in there. Bug
> squad?
> At any rate, it's in
> <URL:http://lilypond.org/doc/v2.18/Documentation/notation/single-voice#chord-repetition>.