South Korean singer Psy (R) practises some "Gangnam Style" dance steps with UN Secretary-General Ban Ki-moon during a photo opportunity at the UN headquarters in New York Oct 23, 2012. It's not all war and peace at the United Nations. UN chief Ban Ki-moon added pop music and supersonic skydiving to his agenda on Tuesday when he met with "Gangnam Style" South Korean singer Psy and Austrian daredevil Felix Baumgartner. Psy's song "Gangnam Style," which mocks the consumerism of a rich Seoul suburb, and hit horse-riding-style dance went viral on video-sharing website YouTube. It has been viewed more than 530 million times on YouTube since it was released in mid-July.[Photo/Agencies]