Ronnie James Diaw is an American rock, heavy metal singer, songwriter and music producer. He has led, participated, or founded many orchestras, including Elves, Rainbow, Black Sabbath, Heaven and Hell, and his own orchestra-Dio. He is famous for the heavy metal culture that popularized metal gestures, and his medieval lyrics. Dio has a powerful and flexible sound range, and can sing heavy metal, hard rock and light folk songs. Deep purple, rainbow guitarist Ricky Blackmore said that Dior’s singing “made his back shudder”.