Tony Iommi considered the difference between Black Sabbath's lead singers, original leader Ozzy Osbourne and his replacement, Ronnie James Dio.

Ronnie James Dio Ronnie James Dio is one of heavy metal’s most legendary lead vocalists, and undoubtedly its most well-traveled, having fronted no less than three classic bands, including the ...

He's not afraid of pyrotechnics and the rest of the band prepares a tight, powerful, and heavy environment for his lead ...