The Jethro Tull album "Night Cap: The Unreleased Masters 1972-1991" is a compilation of studio recordings from the early 1990s, featuring a selection of hard rock tracks from the artist's career. Released in 2000 on CD by Chrysalis Records, the album showcases the band's evolution over the years, with a mix of pop and rock genres.
Those familiar with Jethro Tull will recognize some of these tracks as the proto-Passion Play found on the 20th Anniversary set. This album includes even more of that as well as other rare unreleased material. Definitely worth it for the true Tull fan!