What changes have taken place in the cultural attributes of Xia and Shang music after it entered the class society? Give examples.

Starting from Yu Xia, China entered the class society from primitive society, and successively established the first slave society-Xia Dynasty and the second slave dynasty-Shang Dynasty.

The musical form in Xia and Shang Dynasties is in the same strain as the original music, but the form has not changed much, but the content clearly reflects the great evolution of the cultural nature of music and dance works after they entered the class society. The "Great Summer" in Xia Dynasty and the "Great Cloud" in Shang Dynasty are all based on "people" and reflect the will of the rulers, which is unprecedented in primitive music and dance. From "praising god" to "praising people", the music and dance in Xia and Shang Dynasties still have not got rid of the restriction of the consciousness of worshipping god, especially businessmen are superstitious about people. They all use tortoise shells and animal bones to predict good or bad luck and plead with ghosts and gods. Therefore, the music and dance of Shang people are entertaining both gods and people, which is a very glorious era in the music history after China entered the class society.