Your favorite prog rock music? ?


I was just listening to, and burning some CDs for work when I heard "Time and a Word." I started thinking about some of the prog rock I have, but wondered what I should have that I don't have...

I mean music!
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WOW Caterham!!! I forgot to mention Robert Wyatt legacy. Matching Mole and so on. How about "Rudy Is Stranger Than Richard", "Rock Bottom" and "Shleep"? True gems!!!!!!!!!
R_burke! You beat me to Ozric Tentacles! :) Here's another great band that came to me, IQ.
Lot of good ones mentioned, but Dream Theater has to be included in my opinion. Probably the most technical of the groups.