". South Korean rapper Psy (C) performs during his concert ""Happening\"" in Seoul April 13, 2013. Psy will perform \""Gentleman\"" in public for the first time on Saturday at a concert at Seoul\'s World Cup stadium but he has been coy about what dance to expect this time, except to hint that it is based on traditional Korean moves. Psy released his new single on Thursday hoping to repeat the success of \""Gangnam Style\"" that made him the biggest star to emerge from the growing K-pop music scene. REUTERS/Lee Jae-Won"