Peter, Shaun and Tim discuss their opinions of the fourth album by Jethro Tull, Aqualung. The discussion includes: Jethro Tull’s innovative lyrics, whether their style precipitated prog rock and heavy metal, why the album was so big in America, and, most crucially, was it a concept album or not? Also, did Ian Anderson really threaten to do a flute solo if the band didn’t nail their solos in two takes? What's the English word for pants? And what’s it like to share a bathroom with John Bonham?