I saw a post about the SKOAR language here on HN in late 2015:

https://news.ycombinator.com/item?id=10180423

In the comments, I saw reference to MML ( Music Macro Language ... not exactly what I think the MML is on the list. ) Here's the one referenced in the HN post.

https://en.wikipedia.org/wiki/Music_Macro_Language

At the time, I built a small interpreter that included MML as an embedded language, but I don't think I have the (Windows) binaries handy.