Inside black sabbath: a critical review 1970 1992 (2002)

Using rare previously unreleased film of the original Ozzy Osbourne line-up from 1971 never before available on DVD, this superb independent film sets out to discover what makes a great band and poses the tricky question: who was the best Sabbath singer Ozzy, Dio or Martin? Also featured are extensive interviews with Tony Iommi, Neil Murray alongside leading music critics and working musicians.