Music not playing?

I've been having this problem for a while, the sound effects still work so it's not my volume, it's not a problem with other games, only DTI. I can still hear it for a second if I switch servers, but then it goes silent. It's not a problem on my ipad, only on my PC. It doesn't bother me that much, but I kind of miss it. If anyone knows how to fix this, any suggestions would be appreciated!