The bassist co-wrote "Crazy Train" and "Mr. Crowley" and played on No More Tears, but he hasn't spoken to Ozzy Osbourne in nearly 25 years
"I was also unsure how on earth I was supposed to replace Ozzy Osbourne in Black Sabbath," Dio writes. "In the late Seventies, the idea of a superstar group like Sabbath replacing their frontman was considered unthinkable"
Metal legend's widow and long-time manager, Wendy Dio, finished the book with the help of rock journalist Mick Wall
Metal pioneer's bandmates from Black Sabbath and Dio band will make appearances during event next month
The coffee table tome will cover the vocalist's full experience with the musicians
Almost no bass player in metal history has played alongside more greats, and he's one of the few musicians to tour with both Ozzy and Ronnie James Dio
Hear epic live "Heaven and Hell" from new reissue of band's classic 1980 reboot
Recording features Geoff Nicholls on bass as well as alternate lyrics and guitar solos
BMG to executive produce first-ever career-spanning doc on singer
The heavy-metal group's records — from Angry Machines through Master of the Moon — will feature live recordings and a few never-before-released studio recordings
