Music expresses abstract objective things and human emotions, lacking specific corresponding references. Therefore, the composer's artistic expression has more personal experience and rich and diverse timbre choices. However, painters have long tried to use concrete colors to express abstract things and emotions. Unfortunately, composers cannot choose a certain timbre to concretely represent objective things. Perhaps this is precisely the mystery of music. Music expresses a variety of choices of timbre, enriching people's imagination and adding an artistic temperament to the music.