Xuangong, Rotating the Gong

Xuangong moves the gong to a new pitch level; it is not the same as changing mode

Related

Xuangong (Rotating the Gong)GongdiaoQupai

Time and place

The idea appears in pre-Qin ritual texts. The Liji says that the five notes, six yang pipes and twelve pipes rotate to make each degree the gong. Practice centred on Sui-Tang yanyue and on the gongdiao systems of the Song, Yuan, Ming and Qing, in the court troupes and urban theatres of Chang'an, Kaifeng and Hangzhou. Discussions of folk and opera pitch levels still use the same frame.

What happened

With the twelve lu taking turns as gong, theory reaches twelve gong positions, each with the five modes gong, shang, jiao, zhi and yu, giving sixty modes. Sui-Tang yanyue in practice used twenty-eight, and Song theorists reduced the set further. Xuangong addresses pitch level; fandiao covers modulation or modal change inside a piece, and the two are often joined as xuangong zhuandiao. Gongche notation records pitch level through diaomen, while the flute's tube note fixes where the notes actually lie.

Musical features

Xuangong moves the gong of a whole passage to another pitch standard. The intervals inside the scale stay the same, so the melodic frame sounds unchanged, only higher or lower. If the gong stays and the final changes, that is a change of mode, not xuangong. The old twelve lu come from sanfen sunyi and are unequal, so free rotation is limited by instrument and tuning; the Zeng bells, with two pitches per bell, made playing across gong positions more feasible.

What to listen for

Hear Fan Wugeng Diao, where the same Wugeng tune is sung at another pitch level and the outline survives while the height shifts. Then hear Fandiao Zhenzhu Daojuanlian, where fandiao is the folk word for transposition. Finally hear Jiulianhuan Diao, a shidiao carried across regions, its gong position following the singer's voice. None is court xuangong; each is the same operation in folk practice.

Common misunderstandings

The common error is to equate xuangong with modulation of any kind. Xuangong means moving the gong, that is, changing pitch level; a change of modal centre is another matter, and the historical use of zhuandiao and fandiao is not fully consistent. The opposite error is to claim Chinese music never modulates. Opera suites and instrumental qupai change gong and pitch level routinely.

Sources

• 《礼记·礼运》— 旋相为宫一段核对，未引用
• The New Grove Dictionary of Music and Musicians, 2nd ed., entry "China" — modal system checked, not quoted

Used for fact-checking only; all prose is original.