In 1972, King Crimson were in a bit of a mess. The band had been one of the leading lights of Britain’s art-rock scene, taking the ideas and recording approach of The Beatles to an extreme undreamed of. Their 1969 debut album, In the Court of the Crimson King, rewrote the book on what rock and roll could do, but line-up changes had destabilised the band over a series of albums to such an extent where the sole remaining member was guitar virtuoso Robert Fripp, everyone else having quit in the midst of a tour, deciding they’d rather play the…