Which instrument best represents classical Chinese music?

The guqin. Because the guqin has always been the Chinese people's most respected "gentleman's instrument", it has all the temperament of the traditional Chinese culture of the gentleman, but also thousands of years of Chinese philosophy is a symbol of: modest, calm, steady, lofty aspirations, not disturbed by the outside world, and adhere to the lofty ideals. There is no other musical instrument that has been celebrated by so many people throughout history as the guqin. The "qin" of "qin, chess, calligraphy and painting" is the guqin. Confucius played the guqin. The guqin is also played by Yu Bo Ya.

In fact, in my opinion, the guqin, the sword and the brush are the best symbols of the Chinese spirit.