The end of the classic Black Sabbath lineup was difficult for all involved. Left without a band, Ozzy Osbourne had to build a new career from the ground up. As for Tony Iommi and the rest of Sabbath, ...

Tony Iommi was never against collaboration, but he knew that some musical roads weren't worth pursuing all that often.

When Tony Iommi started working with Ronnie James Dio, he had to change the way he wrote music, and it altered him forever.