Because there are many people who like to watch it.
Dancing usually refers to moving at a rhythmic pace to music, either alone, with a partner, or in a group, for the sake of looking good or pursuing a certain meaning. Origin: "Dancing in our country occurred quite early. There is no way to verify the dance methods of Yunmen, Dawu and other dances. However, there are many dancers recorded in ancient books. In the era of Yao and Shun, dance already existed in the classics, and it reached its peak in the Shang Dynasty. "Dancing in the palace, singing loudly in the room", so that there were thousands of dancers. Dancing in the Zhou Dynasty was especially fashionable. When King Wu was on his way to defeat Zhou, he sang before and danced afterward. The Book of Songs, Chen Feng and Wanqiu Zhang, also said: "Kan Qi beat the drum, Wan Qiu." Under the hill, there is no winter or summer, just like the egret feathers. "There is no winter or summer, and people hold heron feathers to dance. You can imagine the interest of the people in this. At that time, dancing was set as a course in schools. From the emperor to the common people, everyone had to learn it. There is an article in the Book of Rites that says : “Thirteen learns to dance with the spoon, and becomes a child dancing with the elephant. "In the Spring and Autumn Period, Yan Zi also used dance to satirize and remonstrate. Although Qin Shihuang changed "Da Wu" to "Five Elements Dance", the category of dance is not clear. In the early Sui Dynasty, when the world was unified, Zhou music was still used, Niu Hong, Xin Xiuzhi, He Tuo and others It took a year to discuss the music score, but there was no success; the music was not successful, and the dance was not popular in the Tang Dynasty.