 The album was re @-@ released in a fortieth 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 , and comes in two different editions — a " collector 's edition " containing the album on LP and two CDs , as well as DVD and Blu @-@ ray discs and a hardback book ; and a " special edition " containing the two CDs and an abridged version of the book . 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 <unk> copies as their source . 
