This album is my favorite album by black sabbath even though their self titled paranoid and vol 4 are great too i love the instrumentals on this album also tony iommi is a great influence and great guitar player he is a legend and amazing for having the tips of his fingers from his fretting hand cut off also he is the innovater of tuning down to relieve his fingers from bleeding anyways this album is heavy and amazing and i suggest it to anybody that loves heavy metal not just iommi is great but the whole band is great geezer butler is awesome he pounds out bass lines and he knows how to rock i think he is one of the greatest bass players ever bill ward is a great drummer and of course ozzy is great on vocals