19.Some of Nguyen Xuan Khoat's efforts at studying and preserving folk music are enumerated in Phan Thanh Nam "Tron doi vi su nghiep Am nhac dan toc," Am Nhac no. 4 (1993), 3-5. The composer discusses his compositional method in Nguyen Xuan Khoat " On lai quang duong sang tac Am...