It is the law of rhythm of chanting. It is applied to the song of “Byoushi-ai” that matches the rhythm. There are three types of rhythm: hiranori, chuunori and onori. It is essential to understand the Jibyoushi in order to chant a song with a small drum , a large drum, and a drum , and the song that is chanted according to the law of the Jibyoushi is called ” Jibyoushi utai song”. The rhythm of jibyoushi-ai is basically eight beats as one unit (there are also variants of six beats, four beats and two beats) and since this is called eight beats (yattsuoshi/ yahoshi), jibyoushi is also called eight beats.