This track was recorded 40 years ago (1973), but released a year later. It was 23 years after the release (1997) that people learned this was not a studio track but a live track, an improv, in fact (Amsterdam, 1973). Perhaps the most remarkable aspect of this piece of music is the drummer's contribution, a rare occasion where a musician realises—possibly without their fully being aware of it at the time—that the best contribution they can make is to play nothing: http://www.youtube.com/watch?v=q8bXFMPVOcw
Another King Crimson fan! Neat - Did you enjoy the Adrian Bellew version? (I was a fan around the release of Lark's Tongues in Aspic) Saw them in concert a few times - Met Fripp when I worked in radio - very quiet and unassuming fellow.