What is "bianqing"

n. A set of qings, or sounding stones, used in Chinese music.

The bianqing is an ancient Chinese percussion instrument consisting of a set of L-shaped flat stone chimes known as qing, played melodically. The chimes were hung in a wooden frame and struck with a mallet. Along with the bronze bells called bianzhong, they were an important instrument in China's ritual and court music going back to ancient times.

The instrument was imported to Korea, where it is called pyeongyeong. It is still used in Korean court and ritual music.