yes here is the link to my Experimental Extension™
And here is a demo of it: https://makecode.com/_40EPWdWVi1LL
and here is some tests i was using: https://makecode.com/_HJiXXq846Fic just to mess with blocks
I would say that since I made this in a couple of days, it’s definitely VERY UNSTABLE and maybe confusing! So don’t put all your eggs in this one soundtrack basket, because it might slow down your game, or break randomly! And I would hate for your game to be ruined because of me 
THAT BEING SAID if you still do use it I would love to hear your suggestions / opinions! I tried to do something so that people who didn’t want to deal with music too much / didn’t know too much about music could still make some cool sounding background tracks, so I made some preprogrammed “moods”. The level of customization could be exposed for blocks, but it’s definitely a fine balance 
Feel free to ping me if you have any questions / issues or file things in the repo, I would love to work on this extension more!