It's heavy-metal ground zero: Black Sabbath's self-titled debut. The beginning of it all. Forty minutes of groundbreaking perfection, as revelatory today as it was when it was released in the grim winter of 1970 — from Ozzy Osbourne's otherworldly yowl and Tony Iommi's immortal riffs to Geezer Butler's rumbling bass lines and occult-tinged lyrics, and Bill Ward's thundering drums. Doom metal and stoner rock owe the album a particular debt, but there’s no heavy subgenre that doesn’t bear its mark. Revolver Staff