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In page Sido (rapper):

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On 30 October 2009, Sido released his fourth studio album, Aggro Berlin. The lead single, "Hey du!", reached No. 4 on the German charts. In this song, Sido reflects on his upbringing in East Germany and his later life in West Berlin. He revealed that he had concealed his East Berlin origins for a long time due to fear of bullying.[citation needed]