There are 65 pieces of chimes unearthed from the tomb of Zeng Houyi in Suizhou, Hubei Province, which is the largest and most complete set of chimes discovered so far. The chime of the tomb of Zeng Houyi was cast in the Warring States period 2,500 years ago, with a grand momentum, weighing more than 2,500 kilograms and using five tons of copper, which is unique in the history of musical instruments in the world. What's even more amazing is that each chime can emit two tones, and these two tones have a three-degree relationship.