https://en.wikipedia.org/wiki/Impromptu_(programming_environment)
https://en.wikipedia.org/wiki/OpenMusic
http://commonmusic.sourceforge.net/
https://en.wikipedia.org/wiki/Common_Lisp_Music
https://en.wikipedia.org/wiki/Common_Music_Notation
https://en.wikipedia.org/wiki/LilyPond
https://ccrma.stanford.edu/software/snd/snd/s7.html