Ryūkyūan kumi wudui (組踊, Japanese kumi odori) uses a variety of codified vocal techniques to identify the gender and social class of each character. Degrees of musicality, variation in timbre, and pitch inflection are all understood as emblematic of particular character types.
These vocal techniques are constructed within Ryūkyūan society with reference to the Ryūkyūan language, class system, and gender relationships. Many parallels can be drawn between the ways vocal identities are constructed in kumi wudui vocal culture and in other world theater traditions.
This according to “Listening to the voice in kumiudui: Representations of social class and gender through speech, song, and prosody” by Matt Gillan (Asian music XLIX/1 [winter–spring 2018] pp. 4–33).
Below, some examples of kumi wudui vocal types.