[austinprete]

Tidal Cycles! https://tidalcycles.org/

As layer8 mentioned, it is technically Haskell but more specifically a DSL and environment for live coding music.

Pretty fun to play around with!

[skhm]

ah it's not quite Tidal, though I have played with that too. This is csound-expression in Haskell.

https://hackage.haskell.org/package/csound-expression