When I playing in Minecraft of one of my worlds or servers, I always connect with the problem associated with music, which is superimposed on another, besides this, the music that should play in the ordinary world plays in other worlds, such as: Nether and in The End.
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Thank you for your report!
However, this issue is a Duplicate of MC-35856.
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And yours game have a big bug with music in The End, when at the end music ending, I have strange sounds, like a bug with columns.