Jethro Tull, Genesis and Yes are my most listened to artists from the 70's. Then there are Pink Floyd, ELP and other prog rock bands that I listen to occasionally.
Besides Metallica/Iron Maiden/Slayer/metal there are not that many bands from the 80's for me. A notable exception is KANSAS which I absolutely adore. Leftoverture is one of the best albums ever. Incidentally, Mariollion's Misplaced Childhood (also from the 80's) is another long-time favourite of mine.