As one of pop's top 21st-century icons, Britney Spears looms large over the genre—which is why so many DJs and producers have put new spins on her biggest hits. Davidson Ospina turns “...Baby One More Time” into a four-on-the-floor banger, while Diplo brings “Circus” to the favela and Paul Oakenfold gives “Gimme More” an electric shock. Britney's presence adds pop panache to these club-ready beats.