Yes - Tales From Topographic Oceans
Genesis - Suppers Ready
ELP - Just about anything
Hawkwind
Van Der Graaf Generator
Curved Air
Mike Oldfield
Gentle Giant
Gong
Steeleye Span - Not exactly Prog but pure greatness
Tangerene Dream - Also not exactly Prog
Have been luckuy enough to have seen Yes, Genesis, ELP, Hawkwind, Tangs live, among others.
I’m leaving a ton of stuff out, this is just off the top of my head.
Sure wish there was a music, or Prog pinglist.
How could I forget Tull & Pink Floyd?
Saw them both live three or four times.
Thumbs up on Gong.