Ronald James Padavona (July 10, 1942 – May 16, 2010), known professionally as Ronnie James Dio, was an American heavy metal singer. He fronted numerous bands throughout his career, including Elf, Rainbow, Black Sabbath, Dio and Heaven & Hell.
Dio's music career began in 1957 as part of the Vegas Kings (later Ronnie and the Rumblers). In 1967, he formed the rock band Elf, in which he sang and played bass. In 1975, Deep Purple guitarist Ritchie Blackmore founded the band Rainbow and hired Dio as lead singer; during his tenure, the band released three studio albums. Dio quickly emerged as one of heavy rock's pre-eminent vocalists. In 1979, Dio replaced Ozzy Osbourne as Black Sabbath's lead singer and appeared on three studio albums with the band, all three of which met with success: Heaven & Hell (1980), Mob Rules (1981) and Dehumanizer (1992). In 1982, he left to form the band Dio, which itself had two albums certified platinum by the RIAA. In 2006, he founded the band Heaven & Hell with his prior Black Sabbath bandmates Tony Iommi, Geezer Butler, and Vinny Appice.
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