By Narae Kim and Elaine Lies SEOUL (Reuters) – South Korean rapper Psy released his much-anticipated 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. The video for "Gangnam Style" has become the most watched item on YouTube with more than 1.5 billion hits and Psy's horse-riding moves sparked an international dance craze. The details of his latest single, "Gentleman", were kept under wraps until the song was released at midnight in New Zealand (1200 GMT). …
