44. Alexis Krauss
As one half of the world's noisiest pop duo, Sleigh Bells, singer Alexis Krauss has enjoyed a breakout year in 2012. The Brooklyn band's second album, "Reign of Terror," debuted in the Top 20 and landed the band major press and high-profile gigs including a performance on "Saturday Night Live."—Jeff Royer
(Photo: Charley Gallay, Getty Images)
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