In what ways does sound/music help describe personalities and social problems of contemporary Chinese society?

Watch age movie Still Life from Zhangke: https://www.youtube.com/watch?v=9Q0M8EvUkTU Of all the filmic elements, sound and music are especially powerful in terms of their emotional impact and thematic construction. Jia Zhangke’s Still Life provides an interesting case in point. Please discuss the effect of sound/music in place. In Still Life, how does sound/music highlight the meaning projected by filmic images? In what ways does sound/music help describe personalities and social problems of contemporary Chinese society? ). Avoid unnecessary plot summary and generalization, and the more tightly defined the topic, the better.