Would there be heavy metal without Black Sabbath? Possibly. But it wouldn’t sound nearly as menacing or as dark (or as awesome) if Black Sabbath didn’t set the template in the early ‘70s.

Most of his work since retains a connection back to Black Sabbath. Glenn Hughes, the vocalist on 'Seventh Star,' later reunited with Iommi for 'Fused,' and was featured on a collection of sessions ...