Dulcimer, also known as dulcimer, harpsichord, copper harp, fan harp, bat harp, butterfly harp and stringed instruments. Dulcimer is an indispensable instrument in Chinese national bands. Dulcimer is a stringed instrument commonly used in China, which belongs to the same family as piano. Its timbre is distinctive, loud and elastic. When playing slowly, the timbre is like a tinkling mountain spring, and when playing fast, the timbre is like flowing water. The timbre is bright and clear, just like pouring large and small pearls into a plate of jade. The expressive force is extremely rich, and it can be solo, ensemble or accompanied by piano books, rap and traditional operas. It often plays the role of "piano accompaniment" in national instrumental ensembles and national bands, and is an indispensable main instrument.