He started in a group called Energy which was produced by Felix Pappalardi. Laing left Energy in 1969 to form Mountain with Pappalardi, Leslie West, and Steve Knight. He also performed in the Mountain off-shoot West, Bruce and Laing which was essentially Mountain with Jack Bruce sitting-in for Pappalardi. Felix Pappalardi (December 30, 1939 â April 17, 1983) is best known as the producer of the psychedelic, blues-inspired rock trio Cream, beginning with their second album, Disraeli Gears. ... Mountain is an American rock band mainly active in the early 1970s. ... Leslie West (real last name Weinstein) is a American rock guitarist and singer. ... West, Bruce and Laing were a 1970s power trio consisting of Leslie West (guitar and vocals), Corky Laing (drums) and Jack Bruce (bass and vocals). ... John Symon Asher Jack Bruce (born May 14, 1943) is a Scottish musician; a multi-instumentalist, composer, singer and, most importantly, a very influential electric bassist, especially when he was a member of seminal rock band Cream. ...