On their debut, Sigh No More, English quartet Mumford and Sons cooked up rousing, romantic folk rock perfect for sloshed barroom singalongs, earning two Grammy nominations in the process. For this EP, they took a page from the George Harrison playbook, recording in Delhi, India, with fellow touring partner Laura Marling and a nine-member collective of Rajasthani musicians called the Dharohar Project. The result sounds like a pub band crashing an Indian wedding: "Devil's Spoke," which Marling originally cut as a quiet, unassuming acoustic tune, is turned into a lively foot-stomper, thanks to Winston Marshall's banjo and Dharohar Project's wailing vocals and clacking, polyrhythmic percussion. Mumford and Sons' "To Darkness," a sleepy B side, is reborn as a celebratory yawp, with new lyrics and a slow-burning backbeat that eventually explodes into joyful cacophony. The next logical step in Mumford and Sons' career? Sitar lessons.

Video: Mumford & Sons Play Exclusive Acoustic Set Live at Rolling Stone

“The Pretender”

This song wasn't part of the planned track listing for 2007's Echoes, Silence, Patience & Grace, and was put together in a day. "It happened after we recorded a lot of stuff," said Dave Grohl. Yet it ended up as the album opener and the lead single. Grohl called it "a stomping Foo Fighters uptempo song with a little bit of Chuck Berry in it." The singer hinted at the lyrics' political overtones: "Everyone's been f---ed over before and I think a lot of people feel f---ed over right now and they're not getting what they were promised."