A Jethro Tull album that, like its immediate predecessor, Thick As A Brick, consists of a single, continuous forty minute musical piece, at least in theory. (Actually, APP consists of two complimentary works of music, seperated by a short whimsical spoken word interlude entitled, "The Story of The Hare That Lost His Spectacles".) The actual musical part of the album is about Ian Anderson's Dante-esque voyage through heaven, hell, new-age heaven, pagan earth, and finally earth during the apocalypse before his reincarnation. Despite being full of Anderson's trademark puns and whimsy, the music is probably the closest Tull ever got to progressive rock, and Tull fans tend to either love the album or hate it.