The music circle do not reach the agreement whether the pitch of run is Si or bSi.After the research on the ancient and modern books on music as well as the practice of traditional music,the author is certain that the pitch of run is generally defined as Si rather than bSi.However,in Cai Yuanding's narration Discrimination of the Music of Yan recorded in the History of the Song Dynasty,Music Records 17,the pitch of the specific run is bSi rather than Si.
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