He is the brother of John Glascock (1951–1979), who was the bassist of The Gods, later Toe Fat, Carmen, Bee Gees and, most notably, Jethro Tull.
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The original line-up of the band consisted of Cliff Bennett on lead vocal and piano, Ken Hensley on guitar, keyboards and vocals, John Glascock on bass and Lee Kerslake on drums; Kendall replaced Hensley on lead guitar.