Eric asked and I oblige. A post about King Crimson.
I'm far from an expert on them and really only know two eras of theirs - their first album and their "return" in the mid 90s. First album is obviously pre-Belew and back then, yeah, they were one of the wankiest prog bands to ever wank. But they kind of rocked a bit too. Their first album is something of a guilty pleasure. In searching YouTube for a good video of the original band playing live, I found, uh, this. It's "In the Court of the Crimson King" (which was used spectacularly in Children of Men) set to a Tom & Jerry cartoon. This may be best viewed while hanging out with your favorite talking towel.
As for Belew's involvement - I actually have not heard that first album with him. By the time I pick them back up in the 90s they are firmly in the mode of "old guys showing off their virtuosity". Which I guess is what they always were, but at least when they were younger they had some ambition and gusto. Now they're just... well, judge for yourself. Here's "Elephant Talk" from, I don't know, some album with Belew. VROOM maybe?