It's not the first time in my life I've heard them described that way. They were a rock band. Period. They dabbled in different types of rock (psychedelic, space, art) in the very beginning of their careers, but like I said.....come Obscured By Clouds, they were a rock band. I don't know how many interviews of theirs I've read/watched where they talked about intentionally moving away from something they felt they were being pigeon-holed into. They were never progressive rock, and as I said, hated being called that.

Also, Bob Dylan was not progressive rock. Bob Dylan is so far removed from what progressive rock was and is, you couldn't see it with the Hubble telescope. Same with The Beach Boys. Making a concept album/thematic album doesn't make you a progressive rock band. Frank Sinatra is credited as releasing the first concept album, is he progressive rock now too? Sgt. Peppers wasn't progressive rock, either. What it was was the first time a band made an album that was meant to be a whole album, not a collection of singles. That may have been progressive thinking for the time, but it wasn't progressive rock.