Training to have a long breath ( 1 minute non stop) to sing overtones, Limeil Brévannes, FRANCE, 2009 QuangHai Tran Ajoutée le 22 févr. 2009 Trân Quang Hai showed his method and gave an example with a long breath of 1 minute without stopping with a melody with overtones QuangHai Tran Ajoutée le 22 févr. […]