Two musics playing at he same time

I run OS X Mavericks with Java 6, and I notice this, too.

Happens to me quite frequently, just didn't report it because it isn't that big of a deal for me. I have figured out that if you go into the menu and then to the options, and you change the music sound at all, (Maybe that last part isn't even required.) the songs end and [a] new one(s) will not begin for a bit.