Tran Quang Hai shows the undertone singing, 09 july 2011 16.02.2018 by Hai Tran Quang Tran Quang Hai shows the undertone singing, 09 july 2011 QuangHai Tran Ajoutée le 9 juil. 2011 Tran Quang Hai shows how to sing understones . Filmed in Limeil Brevannes, France 9 july 2011