I've gotten the mushroom biome music to play, actually. You just need to make the biome rather large. Like, try spraying dark blue solution over a decent-sized area of surface jungle. The background's super dark, though. Like, so dark that i cant see the mushrooms. Not sure if thats intentional though.You know, I've been wondering this for a while. Dunno if anyone's asked about it yet either.. but listening to the soundtrack and looking at the track release list, when the newer songs were added, such as the Dungeon, Desert, and Ice biome themes, the Mushroom biome theme was added too. So why is it not present in this version while the others are?
This puzzles even the Truffle.