After fronting Elf, Rainbow (featuring Deep Purple guitarist Ritchie Blackmore), and Black Sabbath (after Ozzy Osbourne's departure), legendary vocalist Ronnie James Dio formed a band bearing his own name in 1983. Dio quickly became one of the world's top heavy metal acts. In the late '80s, lineup changes unsettled the group, but the tenacious frontman persevered, leading Dio... Wikipedia