15. Outkast, "Rosa Parks" (1998)
This Dirty-South booty chant was the funky-bus jam of the decade, plus the harmonica solo of the decade. (Sorry, Blues Traveler!) This was where the rest of the country first got a taste of what Big Boi and André were brewing down in the dirty-dirty ATLien nation. It was also where we learned the word "crunk." And it still sounds insane.