Although I was one of the first to put forward the policy of creating a new music genre to replace the old music, I always pay attention to carefully study the melodies of popular music in each locality. from there to develop reform music. After grasping the content and form of most of the folk music in the North such as Hat Co La, Singing Quan Ho, Hat Cheo, Hat A Dao, etc.. at the beginning of this 1944, I came across a system.
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