Unfortunately I don't know a whole lot about King Crimson, but I'd really like to. The only stuff I've heard is what I've found on the internet, but I've been meaning for a while now to scrape together $15 and buy a few vinyls. What makes them so interesting, I think, is all the underlying jazz and classical influences; it's like they've stripped rock down to its bare elements, and replaced blues as the driving influence with jazz and classical music. And don't get me wrong, I'm a big fan of the blues; I listen to John Lee Hooker, Elmore James, Buddy Guy, etc whenever I get a chance, but I think it just makes for an infinitely interesting sound. Plus they have such a crazy history, as far as members entering and leaving the band and all. Any fans might want to kill me for making this comparison, but it sort of reminds me of Queens of the Stone Age, where the brain behind it all is the only real constant and the other members come and go constantly, causing so many interesting relationships and such.