What three-stringed accompaniment instrument is used in Beijing Opera?

Beijing opera accompaniment instruments are divided into percussion instruments and orchestral instruments. Among them, percussion is the soul of Beijing Opera accompaniment instruments. The singing, reading, doing and playing of Beijing opera are all carried out in full accordance with the prescribed rhythm. Singing should be orderly, the back should have rhythm, and dancing should show distinct rhythm. Who will control and embody the rhythm? That's percussion.

Percussion instruments include boards, gongs and cymbals, which are called "martial arts fields"; Orchestral instruments include Jinghu, Jinghu Erhu, Yueqin and Sanxian, which are called "Wenchang".