Aqualung (album)

Aqualung is the fourth studio album by the British progressive rock band Jethro Tull, released on 19 March 1971, by Chrysalis Records. 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. Aqualung's success signalled a turning point in the career of the band, which went on to become a major radio and touring act.

Recorded at Island Records' new London recording studio, it was their first album with keyboardist John Evan as a full-time member, their first with new bassist Jeffrey Hammond, and last album featuring Clive Bunker on drums, who quit the band shortly after the release of the album. Something of a departure from the band's previous work, the album features more acoustic material than previous releases; and—inspired by photographs of homeless people on the Thames Embankment taken by singer Ian Anderson's wife Jennie—contains a number of recurring themes, addressing religion along with Anderson's own personal experiences.

Aqualung is Jethro Tull's best-selling album, selling more than seven million units worldwide. It was generally well-received critically and has been included on several music magazine best-of lists. The album spawned two singles, "Hymn 43" and "Locomotive Breath".