In the 0.8 release, at least when run with the Ren'Py 8.3.4 engine, the music is kind of bugged for me. When it gets to this spot:
play music2 ["<silence 2>"]
queue music2 piratewellermanfast fadein 4
it sounds like it is playing two copies of the track at the same time and jerkily switching between them. If I stop music2 and requeue it, it's fine. Should that be
play music2 ["<silence 2>", piratewellermanfast]
maybe?