Ronnie James Dio was a legendary metal and rock band front man. Ronnie James Dio was in bands Rainbow and Black Sabbath. From there, he formed his own band, simply known as Dio. (These are shown below with his full name). He was also in The Electric Elves, aka The Elves and Elf. The greatest rock hit by Ronnie James Dio was 1983number 2 rock song Rainbow In The Dark. Ronnie James Dio did not have any pop top 20 hits.
However, before he became a metal star, Dio was the leader of pop or vocal groups Ronnie Dio And The Red Caps then Ronnie Dio And The Prophets, as shown below.
Ronnie James Dio lived 1941 to 2010, when he died of stomach cancer.