Imagine listening to a whole bunch of the songs that you've heard on the radio, or at parties, or at clubs, or in your room, for the past 10 (or 20, or 30) years, all at once, ricocheting and popping up against each other in a manic sonic emotional mnemonic soup. Whup, there's the booty bounce with that guy in college and, ohhh, that song I listened to when we broke up, and yeah, there's the one that was always on the radio when we went out two years ago.

That's roughly what it's like listening to Girl Talk - real name Gregg Gillis, a 27-year-old former biochemist from Pittsburgh whose dizzyingly dense pop music mash-ups have made him the talk of the music world.