"Aqualung" is a song by the British progressive rock band Jethro Tull, and the title track from their Aqualung (1971) album. The song was written by the band's frontman, Ian Anderson, and his then-wife Jennie Franks.
While this track was never a single, its eponymous album Aqualung was Jethro Tull's first American Top 10 album, reaching number seven in June 1971.
The lyrics convey a story of a homeless man named Aqualung. In stanzas 1 and 2, he is shown as a dirty tramp—possibly a pedophile ("Eying little girls with bad intent" and "Watching as the frilly panties run"). He cannot but evoke a sense of hopelessness and disgust, as not a single person in the world would ever help him. Aqualung is alone and sick, doomed to "bend to pick a dog-end" (British slang for a discarded cigarette butt). He is miserable—on the bottom of the society's status hierarchy (homeless, lonely, sexually attracted to little girls), sick, dying, and in pain.