It might not be the same thing - this one is XML-based, rather than "BASIC-style" - but I found an example of what Music Markup Language looks like, with Chopin's Trois Nocturne:
https://steyn.pro/mml/examples/chopin.html
For more links: https://en.wikipedia.org/wiki/Music_Markup_Language
https://en.wikipedia.org/wiki/Music_Macro_Language#Modern_MM...
It might not be the same thing - this one is XML-based, rather than "BASIC-style" - but I found an example of what Music Markup Language looks like, with Chopin's Trois Nocturne:
https://steyn.pro/mml/examples/chopin.html
For more links: https://en.wikipedia.org/wiki/Music_Markup_Language