在我国西北地区戏曲秦腔苦音音乐中,存在着“半降si” (即比si音稍低,记作~dSi)和“半升fa”(即比fa音稍高,记作~+fa)两个特殊的中立音。这两个中立音是在秦腔欢音的五声徵调式中上下两个小三度之间各插入中间音而形成的。在la音与do音之间,插入~dSi音,称“中立三度。”中立三度_dSi音与下方相邻音La音,与上方相邻音do In Northwest Drama Qinqiu bitter music, there are “half down Si” (ie slightly lower than the si sound, recorded as ~ dSi) and “half ascending fa” Two special neutral tones. These two neutral voices were formed by the insertion of an intermediate tone between the two minor thirds of the fifth consonance of the Qin chant. Between la tone and do tone, insert ~ dSi tone, called “neutral third degree.” Neutral third degree _dSi tone and adjacent tone below the adjacent La,