Yes
Porcupine Tree
King Crimson
Pink Floyd
Jethro Tull
I notice some people listing the Moody Blues. I remember the prog rock Usenet group often debated whether they were truly prog or just art rock like Supertramp and the like. If both bands count as prog, they'd edge out Floyd and Tull for me. Supertramp in particular might even be #2 after Yes if they count. I just adored those bands back in my prog-rock-filled adolescence.
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36 yr old female; dx age 29. Level 2 Aspie.