Editing Ronnie James Dio (section)

===Black Sabbath===
{{main|Black Sabbath}}

Following his departure from Rainbow in 1979, Dio joined Black Sabbath, replacing the fired [[Ozzy Osbourne]]. Dio met Sabbath guitarist [[Tony Iommi]] by chance at [[Rainbow Bar and Grill|the Rainbow]] on Sunset Strip in Los Angeles in 1979.<ref name="hotten" /> The two musicians were in similar situations, as Dio was seeking a new project and Iommi needed a vocalist. Dio said of the encounter, "It must have been fate, because we connected so instantly."<ref name="hotten" /> The pair kept in touch until Dio arrived at Iommi's Los Angeles house for a relaxed, getting-to-know-you jam session. On that first day, the duo wrote the song "Children of the Sea," which appeared on the ''[[Heaven and Hell (Black Sabbath album)|Heaven and Hell]]'' album, the first the band recorded with Dio as its vocalist, being released in 1980.

The follow-up album, ''[[Mob Rules (album)|Mob Rules]]'' (1981), featured new drummer [[Vinny Appice]]. Personality conflicts began emerging within the band. "Ronnie came into the band and he was doing whatever we told him, basically because he wanted the gig. The next album was a little different," Iommi recalled.<ref name="hotten" /> In 1982, conflict arose over the mixing of the ''[[Live Evil (Black Sabbath album)|Live Evil]]'' album. Iommi asserted that the album's engineer began complaining to him that he would work all day long on a mix, only to have Dio return to the studio at night to "do his own mix" in which his vocals were more prominent.<ref name="hotten" /> This was denied by Dio.<ref>{{cite journal|last=Welch|first=Chris |author-link=Chris Welch |title=London Calling|journal=Record|date=June 1983|volume=2|issue=8|page=4}}</ref> The conflict led to Dio and Appice ultimately quitting the band later that year.

In 1991, Dio returned to Black Sabbath to record the ''[[Dehumanizer]]'' album. The album was a minor hit, reaching the Top 40 in the United Kingdom and No. 44 on the US [[Billboard 200|''Billboard'' 200]]. The single "Time Machine" was featured in the movie ''[[Wayne's World (film)|Wayne's World]]'', the tenth highest-grossing film of 1992. Close to the end of 1992, Dio and Appice again left the band, citing an inability to work with Iommi and Butler.