4. Aerosmith, Britney Spears, N'Sync, Nelly & Mary J. Blige (2001)
People still love to argue over this one: Brilliant or insane? Personally, I'm a both man. In fact, I'm getting the "Walk This Way" jam tattooed on my face, as soon as they invent GIF tattoos. It was a scandal at the time – a couple months later, in the middle of inducting Aerosmith into the Rock and Roll Hall of Fame, Kid Rock paused to ask, "What were you guys thinking?" But "Walk This Way" has to be one of the most demented three-minute spectacles ever aired on TV. Britney, in silver football pants, starring as the Missy Who Was Ready to Play. Mary J. Blige wailing along. Nelly rapping over Joe Perry's guitar solo. Really, the whole gloriously sleazy history of American pop music is here in this performance.