[racket] music mini-language

See https://github.com/mental/bloopsaphone which (IIRC) uses a variant
of ABC notation.

Neil Van Dyke <neil at neilvandyke.org> writes:
> Anyone currently working with music mini-languages in Racket?
>
> Reason I ask... In my iRobot Roomba Racket interface, I currently have a 
> simple music mini-language that lets you specify a sequence of pairs of 
> note/frequency and duration.  (Roombas have a simple single-voice 
> note-playing capability.)  To make encoding of, say, piano sheet music 
> easier in the mini-language, I'd like to adopt more of the conventional 
> music notation conveniences, such as time signatures.  I've found 
> "https://ccrma.stanford.edu/software/cmn/' for Common Lisp, so I'm 
> wondering whether I should implement a subset of that, or something else 
> that Racket people are already using.
>
> Neil V.
>
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