The 20 Most Memorable Duets of All TimeCollaborations to remember, from Gaga and Springsteen to Alice Cooper and the Muppets
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Britney Spears and Aerosmith, 'Walk This Way'
N'Sync doing Aerosmith's "Walk This Way" at the 2001 Super Bowl halftime show was weird, but the crazy really kicked into high gear when Britney Spears came out (with a striped tube sock on her arm) to duet with Tyler on the second verse. By the end Mary J. Blige and Nelly even got in on the action. The next year they stopped the mash-up madness and just brought in U2.