Pham Duy Vietnamese Phạm Duy Born October 5 1921 - January 27 2013 Was A Very Popular And Prolific Vietnamese Songwriter. He Along With Van Cao And Trinh Cong Son Was Widely Considered One Of The Three Most Salient Figures Of Modern Non-Classical Vietnamese Music. Pham Duy's Musical Career Spanned Fifty Years. He Wrote Over One Thousand Songs Which He Divided Into Different Periods Folk Heart Spiritual Profane And Children's Songs.