Mum No More: Mumford & Sons

London’s underground folk movement has finally crossed over stateside with this year breakout folk stars, Mumford & Sons.

The band’s stunning debut album, Sigh No More, has already gone platinum in the U.K. and the band has sold out venues for their U.S. tour -- which kicks off tonight in Cambridge, Mass. -- and signed on to perform at Lollapalooza in August.

Led by singer/guitarist/drummer Marcus Mumford, the quartet has been playing together since 2007 and actually self-made their debut album.

“We made this record before we had a label,” bassist Ted Dwane tells RadarOnline.com. “Our aspirations are very humble. It’s really our record. So it way exceeded our expectations.”

Sonically, the guys weave together their varied influences, including country, bluegrass, rock and folk, while vocally they’re big on harmonies in the vein of Fleet Foxes. Lyrically, the album is literary gold, influenced by the likes of Shakespeare and Steinbeck. “We all read a lot,” says Ted.

The product is a gorgeous rootsy stroll through heartbreak. On Blank White Page, over stark instrumentation Marcus asks pointedly, “Tell me now where was my fault in loving you with my whole heart?”

The unforgettable single Little Lion Man looks inward after a love affair gone awry and Marcus strikes a relatable chord for most everyone when he proclaims, “Weep for yourself, my man, you’ll never be what is in your heart.”

When performed live, the songs swell with intensity. The guys stomp and harmonize in unison and get the crowd clapping along, proving they have nothing short of a promising career ahead.

And through it all they’ll do it together—a principle that their mom-and-pop name derives from. “It made it feel like a family business,” says Ted of the band’s unique moniker. “Because we’re all equally invested in it.”