Ronnie James Dio

Singer had been going through chemo and was unsure if he'd be up to the task.

He may never have fronted Black Sabbath if British glam band voted him in.

He praised his replacement but said leaving the band was "just like getting divorced."

Tony Martin says he was asked to return after being fired when Tony Iommi told him album wasn't "working out."

The Dio hologram cost over $2 million.

See exclusive photos from the book.

Read our exclusive interview with metal's legendary godfather.

The band also starring Tony Iommi, Geezer Butler and Vinny Appice.

Remastered versions of 'Heaven and Hell' and 'Mob Rules' will be released with extensive bonus material.

Two types of windmills, the duck walk and many more.