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Ozzy Osbourne said that former Black Sabbath bandmate Tony Iommi still intimidates him to this day.

In a recent episode of Rick Rubin’s podcast Broken Record, Osbourne admitted that the guitarist has always intimidated him.

“People will say to me, ‘Why did you always sing on the side of the stage?’” he said. “I don’t fucking know … it’s just fear, I suppose. ‘Cause Tony, he’s one of the few people who could walk into this room right now and I would fucking feel intimidated. He intimidates the fuck out of me – and he knows it.”

But the Prince of Darkness also called the guitarist the “most irreplaceable” member of the band.

“He’s always going to be the greatest – no one can touch him,” Osbourne praised Iommi. “And actually, to this day, I still don’t understand how he plays guitar, ‘cause he’s got no fingertips. He plays with plastic fingers.”

“We were all part of the band, but he was the more irreplaceable one,” he added.

Listen to the full podcast here.