High Quality Content by WIKIPEDIA articles Aqualung is the fourth studio album by the rock band Jethro Tull. Released in 1971, Aqualung, despite the band's disapproval, is regarded as a concept album, featuring a central theme of "the distinction between religion and God." The album's "dour musings on faith and religion" have marked it as "one of the most cerebral albums ever to reach millions of rock listeners."Aqualung's success marked a turning point in the band's career, with them going on to become a major radio and touring act.