Main Menu's Music BROKEN

When I launched Minecraft 1.7.2, music started playing, at first normal and then progressively more broken-sounding. It seemed as if a song would start to play, then before its runtime was over another track would begin. This layered up to what sounded like 4 simultaneous tracks at the most. The musicf**k receded, and then picked back up again; at this point I was scared so I immediately quit the game.