However Alt-J's experimental art-rock album An Awesome Wave and London singer Jessie Ware's debut Devotion have been tipped for success by rival bookmakers Paddy Power.
Alt-J 's debut, "An Awesome Wave" (Canvasback), mixes alt-rock, electronica, experimental a cappella vocals and folk in a clever album that zigs and zags with each track.
Alt-J and Mumford And Sons are also up for best British group, a shortlist that also takes in stadium rock with Muse, teen pop with One Direction and atmospheric indie with The xx.