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Lilypond (a tex inspired music markup language, with scheme integration) is also noteworthy!

Lilypond had such beautiful output, though the amount of time since I have used it can be measured in years--is it still setting the typesetting bar above Finale, Sibelius, etc?

You can play with ABC in the browser here[1][1a] and with LilyPond here[2].

[1]https://composing.studio/

[1a]https://news.ycombinator.com/item?id=28615418

[2]https://www.hacklily.org/

And LilyPond? Even though I'm not sure I'd consider it to be a small language...