“Ozzy would never stand in front of the bass rig. He told me to turn it down one night, so for a laugh I turned it up”: Geezer Butler names the Black Sabbath album that captured his favorite bass tone

“If it hadn’t been for music, I’d have ended up killing myself”: the epic life and turbulent times of Black Sabbath’s Geezer Butler

“I couldn't afford a real bass guitar, so I just tuned the strings down on a Telecaster”: How Geezer Butler went from playing bass on a guitar to the ominous riff that defined one of Black Sabbath’s darkest moments