The album was simply called Black Sabbath , and its impact was seismic, immediate, and terrifying.

Before 1970, "heavy" music existed, but it was largely the domain of psychedelic blues and the riff-rock of bands like Led Zeppelin and Cream. However, Black Sabbath did something different. It didn't just play the blues; it dragged the blues through the gutter, doused them in gasoline, and set them on fire.

The album’s structure is brilliant: a complete narrative arc from supernatural terror to psychotic breakdown to anti-war despair.

Best for: Historical appreciation and early heavy metal fans.