Premise: The Condensed 21st Century Guide to King Crimson is a compilation by progressive rock band King Crimson, released in 2006. It contains select studio tracks from the two box sets, "The 21st Century Guide to King Crimson – Volume One – 1969–1974" and "The 21st Century Guide to King Crimson – Volume Two – 1981–2003".
Hypothesis: "The 21st Century Guide to King Crimson - Volume One - 1969-1974" covers six years of the band's music.