Thanks for lettign me know, could you me which browser you are using, maybe it's an compatibility problem.
If that's not it, in the bottom right there is a sound slider inside the game, maybe that was turned down or secondly the music starts very quite and could seem like it's not working.
thanks for getting back to me! :)
I tested on edge, sound does sorta work but there seems to be some problems with edge streaming the music (it's not actually downloading the songs). And it took quite a while for the music to start playing when I tried.
Fom my research it unfortunatly seems like it's a problem of the browser and I can't do much on my end.