“Many years later, Ozzy either told me or I read it someplace — Geezer had come back and told him he felt threatened by the bass player in the opening act. He didn't think that was a good sign.

The track features Ronnie James Dio on vocals, Tony Iommi on guitar and Bill Ward on drums, but it’s not clear who plays bass. Geezer Butler’s absence during the writing sessions for what would become ...