What is (in your opinion) the best album run in history?

My pick will definitely be Black Sabbath's first 6 albums. They were incredibly important, influential, defining but most of all they were all very different from each other (inside the respective genre), coherent, creative and filled to the brim with incredible all time riffs and performances... And just insane songs overall, the amount of great material is absurd.

Black Sabbath, Paranoid, Master of Reality, Vol. 4, Sabbath Bloody Sabbath and Sabotage.