Princes of Darkness: Ozzy and Slash at Toyota Center

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For metal fans, Ozzy Osbourne's now 42-year-long career represents a platinum standard of evil cool. You start with Black Sabbath, work your way through the band's first four indisputable albums - made in the tiny two-year period between 1970-72 - and swear your undying allegiance to all things dark forever. Read full review of Ozzy Osbourne's performance, with Slash as opener, at Rocks Off. PHOTOS BY GROOVEHOUSE