"Glenn Cornick, who has died aged 67 after suffering from heart failure, can take much of the credit for the memorable music created by Jethro Tull on their first three albums, when they were a tightly knit band and not merely accompanists for the increasingly dominant singer/flautist/composer, Ian Anderson. Although the band achieved its biggest commercial breakthroughs after Cornick, the original bass player, left the group, with ambitious concept albums such as Aqualung (1971) and Thick As a Brick (1972), he and the drummer, Clive Bunker, were critical in forming the band's sound, which skipped deftly, and uniquely, between blues, folk and rock, with an added flavour of jazz."
http://www.theguardian.com/music/2014/sep/14/glenn-cornick 2