At their best, they actually rocked as hard as any other group one can name. At their worst, they were pompously dull. Most people remember them for their latter tendency, that became more pronounced over time. For me, though, I prefer to remember good things. If you disagree, well, hey, this is music I like. Go find your own video. I found this compilation video.
I just remembered, I never mentioned the band. Welcome back my friends to the show that never ends, come inside, come inside, ladies & gentlemen, EMERSON, LAKE, & PALMER: