 After an American tour in 1970 , bass player Glenn Cornick was fired from the band , and was replaced with Jeffrey Hammond , an old friend of Ian Anderson 's . Aqualung would be the first recording Hammond would do with the band . It would also mark the first time John Evan had recorded a full album with the band , as his only prior involvement was to overdub several keyboard parts on the previous album , Benefit . The album was one of the first to be recorded at the newly opened studios of Island Records in Basing Street , London . Led Zeppelin were recording their untitled fourth album at the same time . In an interview on the 25th anniversary edition of the album , Tull 's bandleader Ian Anderson said that trying to record in that studio was very difficult , because of its " horrible , cold , echoey " feel . There were two recording studios at the location ; Led Zeppelin worked in the smaller studio while Tull got the larger , which was the main body of a converted church . The orchestrals were arranged by David Palmer , who had worked with the band since 1968 's This Was , and would later join as a keyboard player . Aqualung would be the last Jethro Tull album to include Clive Bunker as a band member , as he retired shortly after recording to start a family . 
