A rule of rhythmic structure for Hyōshiai, or Noh vocals that match the rhythm. There are three types of tempo: Hiranori, chūnori and ōnori. It is important to understand jibyōshi in order to chant accompanied by the kotsuzumi (literally, “small drum”), the ōtsuzumi (“large drum”), and the taiko. In jibyōshi, the vocal is called "jibyōshi-utai." The Hyoshiai tempo of eight beats is basic in Noh, although some variants exist, including six, four, and two beats. Since the eight-beat tempo is called Yatsubyōshi, or Yahyōshi, Jiibyōshi is also known by these names.