Acappella is an all-male Contemporary Christian vocal group that was founded in 1982 by Keith Lancaster, who has variously played the role of singer, songwriter, and producer throughout the group's history. In 1988, a group of former back-up singers formed a spin-off group called AVB. Members of Acappella have included Keith Lancaster, Rodney Britt, Gary Moyers, Duane Adams, George Pendergrass, Wayburn Dean, Robert C.