Film is a thoughtful, intimate portrait of the band by director Toby Amies.
One doesn't even need to like their music to find this film enthralling.
Fripp explains how he still practices for over 45 hours a week, and that doesn't count performing.
In the Court of the Crimson King: King Crimson at 50 is in UK cinemas on 19 October for one day only
22 October is streaming live on nugs.net and available on demand.
The documentary looks at people with the unflinching gaze of a portraitist.