Yes' most progressive piece was not Close To The Edge by any means, Tales From Topographic Oceans' four epics outweigh Close To The Edge on an experimental level. That album is one of my winners for prog albums of all time, with Hemispheres alongside it. Nothing has touched me musically the way those two albums did, Cygnus Book II had me imagining the story as a movie every time I listened, even Circumstances still makes me picture things, not sure what it is but that album is just everything to me. TFTO is a close second, but in a Rush vs. PF thread that is why I take Rush. PF may have moody stuff, but it just doesn't hit me like Rush's mythical fantasy concepts.
I'm afraid I have to be counted among those in the general public who find "Tales from Topographic Oceans" pretty much unlistenable. I tried to warm up to it, but I just couldn't, and "Relayer" didn't fare much better.
Close to the Edge has all the elements of good Progressive (as opposed to merely Experimental) music; it took chances with time signatures, beat in general, arrangement, form, etc, but it did it while remaining musical and in my opinion, beautiful.
And that is why progressive rock didn't do better. So much of it is really just weird sounds that aren't going to turn many people on.
Pink Floyd had that rare ability to always stay musical while being weird, and no matter how far they'd stray from a concept, they'd always bring it back home.


