Ages: Mark Foster, 28; Cubbie Fink, 29; Mark Pontius, 27
Even if the band's weirdly cultish name doesn't sound familiar, you have definitely heard its music. The video for the L.A.-based group's endlessly hummable "Pumped Up Kicks" has been viewed more than 79 million times, and the song itself hit No. 3 on the Billboard Hot 100 and was nominated for a Grammy. Lead singer Foster knows a little something about catchy tunes: he got his start writing commercial jingles in Venice Beach, Calif.