Formed in 1968, Jethro Tull are one of rock's most enduring bands. Their 1971 albumAqualung, with its provocative lyrical content and continuous music shifts, is Tull's most successful and most misunderstood record. Here, music professor and fan Allan Moore tackles the album on a track-by-track basis, looking at Ian Anderson's lyrics and studying the complex structures and arrangements of these classic songs.