China enjoys a long tradition of observing people's customs and attitudes from folk ballads, which means that the ruler can gain a lot of knowledge about people's lives and his or her ruling success or failure through folk ballads. Political ballads are songs composed by the people based on their own life experiences and political status and reflect their general views and attitudes toward some political events, measures, situations or politicians. Therefore they can be criticisms, sarcasms, eulogies or mixed pieces.