[1] He played saxophone and harmonica, and sang occasional lead vocals on the band's first two albums, Music in a Doll's House and Family Entertainment.
King also sang the entire lead vocal on "Observations From a Hill", a song on the latter album.
When Roger Chapman joined as vocalist in 1966, the group had begun to perform under the name The Roaring Sixties.
King left Family in October 1969 owing to health problems and 'musical disagreements'.
As well as session work for Dave Mason and Gordon Jackson, he joined the jazz-rock band Ring of Truth for a brief period, doing a few gigs, then concentrated on composing and playing solo concerts, mostly classical sax with some jazz.