The thrash giants invited him to become their frontman after the release of debut album Kill 'Em All, because James Hetfield wasn't happy with the vocal role alongside his guitar duties.

But the only other man in the frame preferred to remain with Armored Saint, who release seventh album Win Hands Down in June. Bush tells National Rock Review: "It's something that always resurfaces in my life, and I find it funny.

"I felt complimented when the band was proposing the ides to me. But it just wasn't my destiny to be in Metallica. I would have changed the face of heavy metal - and I don't need that pressure."