upgrading the quality of songs means providing a higher quality music experience. According to Baidu Encyclopedia, the upgraded quality of songs provides higher audio quality and richer functions, which can satisfy different types of music lovers. It provides a higher audio compression ratio, which can make music clearer and more realistic. In addition, it also provides more editing functions, which can help users to better control the music playback, such as adjusting the volume and setting the music playback mode. In this way, users can freely control the playing of music according to their own preferences, thus obtaining a better music experience.