Allow biomes to have multiple, non-looping songs
Allow biomes to have song interval times, random song choices, playlist, etc.
Additionally, allow add-ons to add music.
I think random selection would break looped songs. I think selection based on player situation would be more appropiate (but also harder to implement). Also what do you mean by "song interval times"?
Like for biomes with non-looping songs, have an adjustable interval between playing them
Ah, so you want to have a system that is designed for non-looping songs? Not sure if I'm going to add that, since the base game should contain looping songs for all biomes.