The album opens with the sound of rain, a tolling bell, and the iconic tritone interval—the "devil's interval"—that guitarist Tony Iommi stumbled upon after a factory accident nearly ended his career. Listening to the full album reveals a band not yet sure they were a band, but absolutely certain they wanted to scare the hippies out of the flower-power movement.
The original lineup—Ozzy Osbourne, Tony Iommi, Geezer Butler, and Bill Ward—defined the "Sabbath sound": down-tuned guitars, occult themes, and crushing riffs. full album black sabbath