Explanation of overtone singing system in Vietnamese by Trân Quang Hải Explanation of overtone singing system in Vietnamese by Trân Quang Hải QuangHai Tran Published on Oct 8, 2009 Trần Quang Hải explained in Vietnamese the system of overtone singing style to Nguyễn Lê Tuyên Filmed in Paris, October 07, 2009