In ancient China, drums were a tool for communicating public discontent
The Book of Music written during the Sung Dynasty (tenth century to thirteenth century, Emperor Sung unified China) says that the drum was invented by Qibo, a minister under the legendary Yellow Emperor. It says that "the wise Han emperors hung drums and boards throughout their territory to be used by the people to express themselves." In other words, Han emperors had drums placed here and there in the territories, and if people were dissatisfied with the government, they could beat that drum and express their discontent with the government. If they had such a drum today, it would probably beat incessantly all year round.
(Source: Takatomo Kurosawa, World Instrument Dictionary, published by Yozankaku)