暗黒の世界
Three recordings from this box set were previously available on other King Crimson albums, albeit in slightly altered forms. An abbreviated version of "We'll Let You Know" appears on the "Starless and Bible Black" album, released in 1974. Similarly, an abbreviated version of "Providence" was included on the "Red" album, also released in 1974. The live performance of "21st Century Schizoid Man" on CD Two was issued in 1975 as part of the album "USA", featuring overdubbed violin from Eddie Jobson.