It rocks hard. Very hard. If ever there was proof that being a great rock band doesn’t require much in the way of musical proficiency, just a lot of style and a good enough singer, then Black Sabbath would have to be it. Definitely some classic stuff here, with the band in their prime. Their best album, Master of Reality, is only slightly better. Aside: listening to this in my CD changer, when “FX” came on I had to check that the player hadn’t switched to Sun Ra‘s Secrets of the Sun suddenly.