there's always this:
this also recently published:
https://www.loudersound.com/features/how-king-crimson-resurr...
At the West Palm Beach Rock Festival in 1969 the original lineup was one of the bands that almost nobody there had ever heard of. But no-one had ever heard anything like it.
Jimi Hendrix also had some consideration for joining them but did not live long enough for real collaboration.
Greg Lake ended up in Emerson, Lake, & Palmer.
Jon Anderson appeared on some dates once they had regrouped.
When Wetton joined he was easily pulling his weight in a 5-piece, seemed a little nervous on their first American tour though.
In the three-piece lineup, each year Wetton came back literally twice as strong as before.
By the time he was in Asia, that was the time I can not forget the vocals shook the back rows of the indoor stadium as much or more than the bass, like I had never seen before or since.
Then I saw them 2 years later where they played a much extended version of De Futura (and other songs). Great, too, but as a smaller line-up.
None other than Jello Biafra introduced them at a concert at the Fillmore not too long ago, saying how much he dug them. Now THAT was not something I was prepared for!
Most bands decline over the years, but not King Crimson. That said, I have to say the double trio lineup is my favorite era of theirs.
The only other band that IMO comes close in keeping high quality for 50 years is probably Magma. The only difference is that they're mostly staying the same (not in a bad way, mind you), and not necessarily reinventing themselves. Instead they're just getting more refined.