When Black Sabbath parted ways with Ozzy in 1979, it could have all gone badly wrong for them. Instead, with Ronnie James Dio, fresh from Rainbow, they came back rejuvenised with a brace of albums which helped redefine rock and metal in the 80s. Two futher studio albums followed later, including one under their new moniker Heaven & Hell. Black Sabbath The Dio years looks at the three different Dio eras with every album and track put under the microscope, including all of the live albums and bonus tracks. The narrative of the band is often murky, especially in the year which led to the release of their debut Heaven And Hell. For the first time, this period is examined carefully to establish the sequence of events. Contributing to the book are three men who were involved in the production and engineering of the records- Joe Foglia, Mike Exeter and Wyn Davis. Each offers new insight into the working processes. Greg Hildebrandt also contributes the chilling story behind his painting, 'Mob Dream', which became the cover for Mob Rules.