An annual holiday concert attended by President Barack Obama and his family includes something non-traditional this year: a performance by South Korean rapper and Internet sensation PSY.
The "Gangnam Style" rapper, born Park Jae-sang, apologized Friday for using what he says was "inflammatory and inappropriate language" during anti-U.S. protests at concerts in 2002 and 2004.
Obama traditionally attends the "Christmas in Washington" concert of carols and songs to benefit Children's National Medical Center. The 31st installment is scheduled for Sunday evening at the National Building Museum, and to be hosted for a second year by comedian Conan O'Brien.
Other scheduled performers include Diana Ross, Demi Lovato, Scotty McCreery, Chris Mann of "The Voice" fame and "Smash" star Megan Hilty.