Our Mongolian friend doing, as a forfeit (we were playing 'wink-killer'), a traditional Mongolian folk song. It seems all Mongolians can sing so beautifully! I definitely want to learn the language now, so I can sing their songs.
At the end of the clip, the Japanese are saying 'Sugoi' or 'sugee' which means 'Awesome!' but it's also our way of bluffing about Mongolian. 'Zugweer, zugweer' means 'Daijoubu' or 'It's fine' in Mongolian.