Members of Iron Maiden and Tool have formed a surprise supergroup for a one-off performance of a Jeff Beck classic, and video footage has made its way online. Two Iron Maiden alumni, guitarist Adrian Smith and retired drummer Nicko McBrain, united with Tool bassist Justin Chancellor for a cover of “Going Down”. The 73-year-old, who first appeared on 1983's "Piece of Mind," will remain “firmly part of the Iron Maiden family,” with the belief that he will still feature on studio material. Released in 1972, "Going Down" featured on the Jeff Beck Group album, which featured Cozy Powell on drums and Bobby Tench on vocals. You can’t do it with a Les Paul.