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The U.S. State Department revoked visas for a Mexican band slated to perform in the U.S. due to singing "narco ballads," which critics say are songs glorifying drug cartels. NBC News' David Noriega reports on the controversy as a recent concert turned violent after a popular artist refused to sing the "narco ballads."  
U.S. State Department revokes visas from Mexican band due to 'narco ballads'