Your favorite prog rock music? ?

In the Court of the Crimson King
Close to the Edge
In Search of the Lost Chord
Tarkus
Foxtrot
"L"
Lark's Tongue in Aspic
Starless and Bible Black
Gentle Giant
The Aerosol Grey Machine
OK Computer
Kid A

and on and on and on

The Cars. Progressive Music?
I don't think so.

I would not include 10CC, T Rex, Tommy Bolin, Roxy Music, or Santana. Where do you draw the line? Interesting question but if you take any of the agreed upon progressive bands i.e. King Crimson, ELP, Yes, Genesis (with Gabriel) and compare any of the work to "Bang a Gong", "Black Magic Woman", "Love is the Drug", or "The Things We Do For Love", that's where I draw the line.

IMHO

Yeah, let's outline the progressive playlist for tonight.
"Heart of the Sunrise"
"Epitaph"
"Tank"
"Carpet Crawlers"
"Thick as a Brick"
"Lark's Tongue in Aspic"
"Hero and Heroine"
and then top off the evening with "Kharma Chameleon". That works.
:-)