Jethro Tull / Aqualung 1971

Aqualung is the fourth studio album by the rock band Jethro Tull, released in 1971. It is widely regarded as a concept album featuring a central theme of "the distinction between religion and God", though the band have said there was no intention to make a concept album, and that only a few songs have a unifying theme. According to one reviewer, the album has "dour musings on faith and religion" which for him have marked it as "one of the most cerebral albums ever to reach millions of rock listeners". Aqualung's success signalled a turning point in the career of the band, which went on to become a major radio and touring act.