Tam Luan Cuu Chuyen is a Nha Nhac song in the Dai Nhac repritoire. Dai Nhac are songs reserved for rituals involving the Emperor. Nha Nhac is Vietnamese court music. It first developed in the Tran Dynasty, but it’s highest point in development was the Nguyen Dynasty. It has strong Khmer, Champa, and Chinese influences. I do not own anything in the video, no copyright infringement intended.