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Greg has sang the National Anthem of the United States ("The Star Spangled Banner") at specific events on a few occasions.
Greg sang the National Anthem at Miller Park, home of Major League Baseball's Milwaukee Brewers (he is a native of Milwaukee, WI suburb Racine). This took place on July 31st, 2007 before a game between the Brewers and the New York Mets. He was in town for Vans Warped Tour 2007.
Greg sang the National Athem before the Reason Rally in Washington D.C. on March 24, 2012.