= SuperCollider
{c}
{wiki}
https://github.com/supercollider/supercollider
<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: https://doc.sccode.org/Guides/Non-Realtime-Synthesis.html
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>: https://stackoverflow.com/questions/65360414/how-to-play-a-supercollider-file-non-interactively-from-the-terminal-command-lin
Sample composition with custom synths + notes: http://sccode.org/1-5cl
https://leanpub.com/ScoringSound looks like a decent tutorial, it is basically the <Csound FLOSS manual> for <SuperCollider>.