This set compiles what Robert Fripp contends is "a comprehensive overview for new ears of all that is necessary in the Crimson corpus." Going on to acknowledge that "old-generation completists might disagree with some choices, but material not included here is available for new-generation completists, should they wish." Enthusiasts' personal preferences aside, The 21st Century Guide to King Crimson, Vol. 1: 1969-1974 (2004) is the first of two four-disc volumes gathering the entire recorded output of the band in its variety of personnel. Each CD contains highlights from a specific era, either in the studio or live, and the material is presented in chronological order.