Heaven and Hell was a short-lived project led by original Black Sabbath members Tony Iommi and Geezer Butler, with contributions from two other former members, Ronnie James Dio and Vinny Appice, who had played on several of the band's albums after the departure of Ozzy Osbourne and Bill Ward. It was named Heaven and Hell, a reference to the band's acclaimed 1980 album, to distinguish it from Black Sabbath, which at that time was still active under the leadership of Ozzy Osbourne. However, the initial project was only intended to record several songs for a Black Sabbath compilation album based on the Dio era, specifically the period between 1980 and 1982. But after recording enough material, they decided to release a full album under the Roadrunner label titled "The Devil You Know", which was released in mid-2009. While not reaching the brilliance of such legendary works as their debut album or others like "Paranoid", "Master of Reality", "Vol. 4", "Sabbath Bloody Sabbath", or the aforementioned "Heaven and Hell", this is another great demonstration of heavy metal and hard rock with Iommi's demonic guitar riffs, Dio's somber vocals and powerful, distinctive voice, and the impeccable rhythm section of Butler and Appice. Heavy doom metal like "Atom And Evil", lively heavy rock "Fear", frenetic heavy metal "The Turn Of The Scew" and "Eating The Cannibals" or forceful leaden hard rock like "Bible Black", make up a work that would soon capture the most unconditional fans of the group and millions of heavy metal followers around the world.

