No Music

I've been playing the game on and off sometimes for a couple hrs at a time. Since I updated to the latest snapshot 15w45a I have noticed there is no background music in any of the dimensions and no thunder. Usually lag spikes get rid of the music, this time there isn't any unless you play a disc in the music box. The file attached I hope is the one you need. If there is anything else I could provide that could assist you please contact me.