Well as I understand it most, if not almost all, the songs were fixed up a bit in the studio. I do know SBS wasn't played to the audience at the gig. But I agree that Speak/Talk of the Devil was a hard time for Ozz and he pulled it off brilliantly.

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Tony Iommi = God, his arch angels are Ozzy Osbourne, Dave Walker, Ronnie James Dio, Ian Gillan, Dave Donato, Glenn Hughes, Ray Gillen, Tony Martin, and Bill Ward (bassically everyone who sang on a song labeled Black Sabbath)