Mumford and Sons wear their bluegrass, folk and country influences on their homespun shirtsleeves, but their intimate, intricate songs will have you falling in love with their London indie take on American folk. They hang out with Laura Marling and Noah and the Whale, who in fact encouraged them to form in the first place – amazingly, considering the assurance and maturity of their sound, they only began playing together in late 2007. Their soaring, heartfelt songs will make anyone with a soft spot for the folk revival go weak at the knees – see if that includes you at T in the Park.