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So Ozzy did a farewell tour in the early nineties. Then got bored and came back. Then Black Sabbath just recently wound up their farewell tour. Now Ozzy gets back on the road this coming May for a 2-YEAR Farewell tour--yes--TWO YEARS...here's more, plus the first tour dates announced http://ultimateclassicrock.com/ozzy-osbourne-farewell-tour-2018/