What’s more common in use: ABC or MML?
and there’s also Alda GitHub - alda-lang/alda: A music programming language for musicians.
Another question: What’s the simplest music language to use?
e.g. for live sessions in the Rack
Last question: Do you want a VCV module that does something similar to this site?
https://framesynthesis.com/experiments/synthesis.js/examples/showcase/