Nightcap: The Unreleased Masters 1973–1991 (1993) is a Jethro Tull double CD album released on 22 November 1993 with older and previously unreleased material.
The first CD contains material recorded in August 1972, much of which would be re-recorded and re-arranged as their sixth album, A Passion Play (1973) (the lyrics to "Critique Oblique" and "Scenario" actually refer to "passion play"). This material has been first revisited for the 1988 20 Years of Jethro Tull box set, and flute overdubs have been added then, but eventually only "Scenario", "Audition" and "No Rehearsal" appeared in the box set as a single track entitled "The Chateau d'Isaster Tapes". This overall title is also used on Nightcap as the title of entire Disc one, and the versions used are all those prepared in 1988, with overdubs.
The second CD ranges from 1974 to 1991. Most - but not all of the songs from that CD will later appear as bonus tracks in the 2000ties remaster series, and in the 2010ties remix boxes of original albums.
The album was produced in limited quantities with proceeds going to charity.
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