INTERVIEWSWATCH: Mumford & Sons Unplugged at SPIN

London's Mumford & Sons play with a unique blend of country, bluegrass, and indie-folk that's quickly turning them into an band to watch -- Blink-182 bassist Mark Hoppus even called them "one of the hottest British bands to cross the pond." Recently, the band stopped by SPIN's New York City HQ to play a two-song acoustic set.

The four-piece indie folk phenoms belted out "The Cave," latest single off the band's 2009 debut LP Sigh No More, plus "Untitled," the b-side from the same single.

With a banjo, accordion, acoustic guitar, and a double bass -- which they later rolled all by themselves through Lower Manhattan to their gig at the not-so-nearby Bowery Ballroom -- the band easily translated the emotion from their live show to SPIN's intimate offices. Gorgeous four-part harmonies abound, singer/guitarist Marcus Mumford's wailing leads were emotive and powerful.