Brain Salad Surgery by ELP
Nursery Cryme by Genesis
In the Court of the Crimson King by King Crimson
Atomic Rooster by Atomic Rooster
Space Ritual by Hawkwind
Tubular Bells by Mike Oldfield
Fragile by Yes
Bedside Manners Are Extra by Greenslade
Fish Rising by Steve Hillage
Meddle by Pink Floyd
Opposite for me I've always considered RUSH progressive hard rock.
I am really surprised to see that Steve Hillage album on your list, I don't mind his work in Gong, but that Fish album is in my top 5 worst I ever bought. I'm not sure even all these decades later I could manage to listen to it again.
Without further ado, here are ten of my all time favorite prog albums. Been thinking about this and it is always difficult to rank them in any kind of permanent order, with the exception of my all time favorite. I don't think any album will surpass it when it comes to my prog collection.
1. Dark Side Of The Moon - Pink Floyd
2. Fragile - Yes
3. Leftoverture - Kansas
4. ELP(Their debut) - ELP
5. Tales Of Mystery And Imagination - Alan Parsons Project
6. On The Threshold Of A Dream - The Moody Blues
7. Selling England By The Pound - Genesis
8. Eldorado - Electric Light Orchestra
9. Act One - Beggar's Opera
10. War Of The Worlds - Jeff Wayne
There are so many others I could have chosen but I wanted to list some bands that had been left out.