The group would have many subsequent personnel changes, the first being Fisher, who produced "A Salty Dog", departing the band soon after its release. The line-up for the first three albums was Brooker (piano and lead vocals), Trower (guitar and lead vocals), Fisher (organ and lead vocals), Knights (bass), Wilson (drums), and Reid (lyricist). Former Paramount Chris Copping joined on organ and bass in 1970. The group appeared at the Isle of Wight Festival 1970. By 1971, the disparities in style had become too great and, after the release of the fifth album "Broken Barricades", Trower left to form his own power trio band and was replaced by Dave Ball. From late 1972 until 1977, the group's guitarist was Mick Grabham.