While playing in my new world I made for the update, I noticed the only music I was hearing was music that normally is exclusive to the nether. I was in the overworld, so this didn't make much sense. After a few hours of playing, I realized it must be a bug. It didn't stop when I reset my game and turned it back on, so I'm not sure what the problem is. I really hope this bug is fixed soon because I really want to hear the overworld music again. The nether music is still good, but it's just not the same.