Mumford & Sons

Mumford & Sons' rootsy folk music is rather serious, but the men who make it aren't. The English band demonstrated their sense of humor in the video for 'Hopeless Wanderer' from 'Babel.'

In a moving tribute to fallen drummer/singer Levon Helm, Zac Brown and Nashville producer T Bone Burnett joined Elton John and Mavis Staples to perform his best-known song, the Band's classic 'The Weight.'

Zac Brown and Mumford & Sons are part of a star-studded group of musicians set to pay tribute to Levon Helm at the 2013 Grammys ceremony this weekend.