That the first time to mention the Zhengsheng and Zhongsheng in the historical literature was the Goryeosa or History of Goryeo in the Korean music history.Both Zhengsheng and Zhongsheng appeared firstly in Dasheng yayue in the periods of Song Dynasty Emperor Huizong,originally refers to two kinds of music or musical instruments with different pitches;however,the Zhengsheng and Zhongsheng for the scholars of Korean music field to discusse were distinguished according to the numbers of the bell set(16 and 12),it related only to the issue of ra...