ELTON JOHN, MUMFORD & SONS, MAVIS STAPLES, OTHERS REHEARSE GRAMMY LEVON HELM TRIBUTE

Late leader of The Band, Levon Helm, will be tributed at tomorrow night's Grammy Awards by Elton John, T-Bone Burnett, Mumford and Songs, Brittany Howard of Alabama Shakes and others, and they talked about The band's influence and comfort with Grammys