Your favorite prog rock music? ?

Some great bands listed above. I second all the Porcupine Tree and Flower King recommendations and would add:

Frost
The Tangent
Early Spock's Beard
Pendragon
Ayreon
Cairo

JSD; I have a copy of Scarlet Rivera.

John

Also the term progressive rock was coined in response to groups that started to write longer songs which allowed the musicians to play solo's on their instruments. Kind of like Rock n Roll's response to improvisation in jazz.

I'll 2nd or 3rd Hawkwind especially space ritual or doremi fasol latido (sp?) i wish i could hear argon accumulator again right now

Here is a band no one has probably thought of putting into the prog rock setting: Grand Funk Railroad. Some of their stuff is very progressive like Inside Looking Out, Into The Sun and The Railroad.

Two more: Iron Butterfly...In A Gadda Da Vida has to be a prog rock masterpiece. How about Focus with Jan Akkerman.