Best Sabbath concert I ever saw was with Ian Gillan on the vocals. Dude had tremendous range.
Worst Sabbath concert I ever saw with on the last tour with Ozzy.
Van Halen opened for them, and we're all like "who the F are these guys?" Phenomenal. The Sabbath came on and wrecked the night. Dio was a huge improvement over a wasted Ozzy.
Ozzy got fired and found Randy Rhoads. That was an electric combo right there.