Mumford and Sons' recent U.S. tour earned the band some of their live best reviews yet, and this live clip shows why. Filmed during their sold out Aug. 28-29 stand at the scenic Red Rock Amphitheatre in Morrison, Colo., the video captures the British quartet in front of a rabid audience tearing through a rousing rendition of 'I Will Wait,' the first single off their forthcoming sophomore album, 'Babel.' Mumford and Sons just completed a month-long U.S. trek that wound down with a Sept. 1 performance at the Aspen Jazz festival in Colorado and are next scheduled to tour Australia and New Zealand in October.