So glad to have this thread... It's a diverse enough sub genre that it deserves to be broken off from the metal thread. Friend texted me about Steven Wilson hitting near us in April, think I am definitely gonna have to go.
I didn't know OSI started sounding good. I got the first album and thought it was pretty awful. I looked at their Wiki article and saw Gavin Harrison joined the band for later albums. That's now a must-listen.
Anyone who doesn't know King's X and calls themselves a fan of progressive music (or Rock for that matter) should hand in their music card. Hands down the most incredible 3 piece ever. Yes ahead of Rush. Amazing chemistry and amazing musicianship.
I think the first band that really got me into prog rock was King Crimson. Had of buddy of mine in high school who introduced me to them with Larks Tongues in Apsic, and I was hooked. Really got me into Rush, Yes, Zappa, etc. Still haven't managed to see any form of them live. Wish I could have seen them with Tool during the Lateralus tour.