You likely can’t have a more auspicious beginning than playing the opening slot for 650,000 fans at the Rolling Stones’ free 1969 Hyde Park concert. Ever since, Robert Fripp’s King Crimson has been regarded as one of the most complex and sophisticated prog-rock bands of all time, with almost as many line-ups as albums. The band is currently “on hiatus”, but you never know what will happen with one of rock’s most mysterious projects.