Ronnie James Dio (born Ronald James Padavona, July 10, 1942 – May 16, 2010), was an American rock and heavy metal vocalist and songwriter. He performed with Elf, Rainbow, Black Sabbath, Heaven & Hell, and his own band Dio, among others. Other musical projects include the collective fundraiser Hear 'n Aid. He was widely hailed as one of the most powerful singers in heavy metal, renowned for his consistently powerful voice. He is credited with popularizing the "metal horns" hand gesture in metal c...