Before Mumford & Sons headed to Bonnaroo in 2010, the U.K. folk-rockers performed a special stripped down show in New York — and we caught it on tape. The group, who are headlining this year, had released their debut, Sigh No More, the year before and were just starting to acquire the hefty following they boast now. The band may be playing the big stages these days, but this clip lets you get intimate with the musicians.