Oh, Emerson Lake and Palmer, Gentle Giant, and so on. (Prog-rock had its commercial heyday well before the Clash.)
Eeeew that brand sucks. I NEVER listen to such as that.
Progressive Rock originated with the Beatles (White Album etc) although I think Yes would be considered the first Progressive Rock Band. Prog-rock still exists (Dream Theater, Radiohead). Prog-rock rides that fine line between cool and self indulgent. ELP falls off into self-indulgent more than Yes. Lots great bands fall into the category (King Crimson, Mike Oldfield, even the Buggles) but a lot of unlistenable stuff flies the Prog-rock flag.
I jumped in this in the middle – how the heck did a thread about the death of a member of the Ramones turn the corner to Progressive Rock?
“It’s a strange strange world we live in, Master Jack”