South Korean singer Psy sings his hit single "Gangnam Style" during a concert at Nanjing Olympic Sports Center in Nanjing, capital of east China's Jiangsu Province, Feb. 2, 2013. It is the first time for Psy to participate in commercial performance on the Chinese mainland. (Xinhua/Yan Minhang)

South Korean singer Psy dances as he sings his hit single "Gangnam Style" during a concert at Nanjing Olympic Sports Center in Nanjing, capital of east China's Jiangsu Province, Feb. 2, 2013. It is the first time for Psy to participate in commercial performance on the Chinese mainland. (Xinhua/Yan Minhang)

South Korean singer Psy dances as he sings his hit single "Gangnam Style" during a concert at Nanjing Olympic Sports Center in Nanjing, capital of east China's Jiangsu Province, Feb. 2, 2013. It is the first time for Psy to participate in commercial performance on the Chinese mainland. (Xinhua/Yan Minhang)

South Korean singer Psy (C) dances as he sings his hit single "Gangnam Style" during a concert at Nanjing Olympic Sports Center in Nanjing, capital of east China's Jiangsu Province, Feb. 2, 2013. It is the first time for Psy to participate in commercial performance on the Chinese mainland. (Xinhua/Yan Minhang)

South Korean singer Psy dances as he sings his hit single "Gangnam Style" during a concert at Nanjing Olympic Sports Center in Nanjing, capital of east China's Jiangsu Province, Feb. 2, 2013. It is the first time for Psy to participate in commercial performance on the Chinese mainland. (Xinhua/Yan Minhang)

South Korean singer Psy dances as he sings his hit single "Gangnam Style" during a concert at Nanjing Olympic Sports Center in Nanjing, capital of east China's Jiangsu Province, Feb. 2, 2013. It is the first time for Psy to participate in commercial performance on the Chinese mainland. (Xinhua/Yan Minhang)