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Lilypond also has a guile API, and if you are not interested in the actual notation generation or at least how it looks, it can make some pretty weird and cool midi files. You can turn it into a kind of makeshift lisp Supercollider pattern generator.

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That is really cool, I had a ton of fun playing with Overtone a few years ago (Clojure Supercollider wrapper).

There's also Impromptu, which I think is Scheme... There's an incredibly cool talk by Andrew Sorensen using it: https://youtu.be/yY1FSsUV-8c

Can you say a bit more about this? I know I can go look at the API, but I had no idea that it was capable of generating (?) MIDI files (I don't have cause to use Lilypond, really). Do you personally use it for generative music? Or something adjacent to that?

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