In April 1971,
Aqualung peaked at number four on the UK Album Chart; when the CD version was released in 1996, it reached number 52. It peaked at No. 7 on the
Billboard's North American pop albums chart; the single "
Hymn 43" hit No. 91 on the
Billboard Hot 100 chart. The album went on to sell over seven million copies, and is the band's best-selling album. The single "
Hymn 43" was released on 14 August 1971, and reached number 91 on the
Billboard Hot 100 charts, spending two weeks in the chart. which also featured the album's title track. The album was re-released in a 40th anniversary edition on 31 October 2011. The release contains a new stereo and 5.1 surround remix of the album by British musician and producer
Steven Wilson, the original quadraphonic mix, and comes in three different editions—a "collector's edition" containing the album on LP and two CDs, as well a DVD and a Blu-ray disc (with better sound quality than the DVD) and a hardback book; a "special edition" containing the two CDs and an abridged version of the book; and an "adapted edition" containing two CDs (with 2 extra songs not included in the other two 40th anniversary editions) and 2 DVDs in a hardcover book (written content is the same as in the Collector's Edition book, only the Chronology differs slightly). Justifying the remix, Steven Wilson said: "Jethro Tull's
Aqualung is ... a masterpiece, but was sonically a very poor-sounding record. So, some didn't rate it as highly as they should have. What we did with
Aqualung was really make that record gleam in a way it never gleamed before. I think a lot of people, including myself, have come around to thinking that the album is a lot better than they even gave it credit for previously. So, there is certainly something very gratifying about being able to polish what was already a diamond and making it shine in a way it never has before". Additionally, according to mastering engineer
Steve Hoffman there were tape stretching problems with the original session mixdown master, implying that many editions of the album used multigeneration copies as their source. ==Critical reception==