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Rock singers, as music teachers liked to make it clear to adolescents in the early 1980s, would only “roar” or “yell around”. That sounded promising – but in reality there was a lot of singing. But then came Udo Dirkschneider, frontman of the band Accept from Solingen, which was about to conquer the world: He really screamed, nagged your ears off your head and scrubbed with his…