High Quality Content by WIKIPEDIA articles! Ronnie James Dio (born Ronald James Padavona; July 10, 1942) is an American heavy metal vocalist and songwriter. He has performed with Elf, Rainbow, Black Sabbath, Heaven & Hell, and his own band Dio. Other musical projects include the collective fundraiser Hear 'n Aid. He is widely hailed as one of the most powerful singers in heavy metal, renowned for his consistently powerful voice and for popularizing the "devil's horns" hand gesture in metal cult ...