US President Barack Obama will reportedly attend a charity concert where South Korean rapper PSY is scheduled to perform, who had participated in anti-American protests several years ago. PSY hit headlines over his much talked about ‘Gangnam Style’, which was the most viewed video last month on YouTube. A spokesman said that the Obama family will attend the December 21 Christmas in Washington concert, as is custom, The Telegraph reports. According to the paper, news reports cite two instances of the 34-year-old “ Gangnam Style” rapper participating in concerts protesting the US military presence in South Korea during the early stages of the war in Iraq. In a 2004 concert, PSY performs another act’s song about killing “Yankees” who have been torturing Iraqi captives and their families “slowly and painfully,” the paper said.