“Aqualung” has a dominant theme but is certainly more, much more, than a concept album hindging on a solitary subject. Anderson explores the struggles of the less fortunate in our society (e.g., “Aqualung,” “Cross-Eyed Mary,” “Up to Me”), teenage angst and formal education difficulties ( e.g., “Wind Up,” “Mother Goose”), and returns to his parental themes with “Cheap Day Return, a tune encompassing Anderson’s feelings while traveling to visit his sick father.

“Aqualung” also cemented the exaggerated image, especially to those only casually acquainted with the band, that Tull was a “heavy rock” group. Years later, a Grammy for best heavy metal album (viz., “Crest of a Knave”) would officially sanction the misconceived stereotype. Yet, “Aqualung” is where Anderson really begins to develop his personal style for acoustical guitar songs with “Cheap Day Return,” “Mother Goose,” and “Slipstream.”

“Aqualung” did establish one of the most notable features of Tull’s music: songs varying with intensity, mixing medium to heavy electrical sounds with lighter acoustical passages (e.g., “Aqualung,” and “My God”). Indeed, every album up to “Under Wraps” (1984) would have at least one such styled number.