When entering singleplayer worlds, exiting, and reentering other worlds too quickly some of the background music gets stuck.
Tried to remove using /stopsound, but it didn't effect music that started on other worlds. As far as I know it stops all the sounds playing, regardless of the source.
A relaunch did solve the problem.
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MalbaCato
Not sure if it's the same bug, doesn't really matter I guess.