This album is one of Black Sabbath's more heavy records, and I like heavy. The lyrics on this album are spectacular and really keep with the pace of the rhythym. Ozzy's vocals are second to none as he belts out the tunes on those tracks with vocals. Bill Ward entrances his audience with his thumping bass drum as he fluently outputs the instrument that he was made to play. Geezer Butler controls the rythym with his awesome bass guitar that collaborates well with Bill. Tony Iommi, the greatest guitarist that ever lived and still is living, by the way, mezmerizes and seduces with the perfect riffs on every measure. The solo is astounding. This is certainly one of the utmost definitive Black Sabbath albums, and certainly is one of the utmost definitive albums of all heavy metal. This is where Metallica got their drive; from the Gods who created metal itself.