@RolandvD
All imho,

The absolute masterpieces :

Yes - Close to the edge (1972) : https://youtu.be/BAuO_2h8MBI

Genesis - The lamb lies down on Broadway (1974) :
https://youtu.be/d-re1RTNlhc

King Crimson - Red (1974) :
https://www.youtube.com/watch?v=sdcMHWBBSm0&list=PLHTo__bpnlYUo1C-5CBeCm48afzMMlquE&index=1

Pink Floyd - Animals (1977) :
https://youtu.be/yFHYCiIYXOA

All of those bands released so much other beauties (before the 80's, apart King Crimson which shines at all released), and much more other bands did as well ! Have a good listen...