Instruct: Classify an Amazon review as either positive or negative.
Query: Can any band really be this consistently good?

I just wonder how Black Sabbath kept doing it. For so many albums to be absolutely perfect, they must have been truly blessed. On this, they do delineate a little with Changes, but that's all right. The sheer quality of all the rest more than makes up for that. Ozzy, Tony, Geezer, and Bill are excellent on this, and it's no wonder they are immortalized--even more so than Led Zeppelin--as the seminal group in heavy metal.