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domain-specific language unfortunately, but at least it's on GitHub, looks promising.
How to play scores and save them to files is discussed at:
They have a nice looking IDE, but running anything from the command-line interface is super hard, much unlike Csound. How to get a decent hello world:
Sample composition with custom synths + notes: looks like a decent tutorial, it is basically the Csound FLOSS manual for SuperCollider.