“闰”到底是变宫（Si）还是清羽（~bSi）？

Is the Pitch of Run Si or ~bSi？

"闰"的音高究竟是变宫还是清羽,音乐学界其说不一。笔者在对有关古籍和今人论著以及传统音乐实际进行了一定的调研思考后,确认在有关古籍中,一般都界定"闰"的音高是变宫而并非清羽;但是,《宋史·乐志十七》所载蔡元定《燕乐原辨》的第二段记述中所说的、那个具有特定注解的,狭义燕乐音阶中的"闰"字,它的音高却独独是清羽而并非变宫,而且并非孤证。

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.