Mumford & Sons busted out a 45 minute set for Legends On Letterman, a series of exclusive performances of some of Dave's favorite bands as he winds down his more than 30 years on TV.

Mumford made their US late night TV debut on Letterman back in 2010. Shortly after the performance, they took off in America and went on to sell out venues all over the world.

The new album 'Wider Mind' is available now, and was recorded in Brooklyn and London.

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