Since music is an art of sound, it is also an art of hearing. The principles of directional reflex and exploratory reflex in psychology tell us that among various external stimuli within a certain distance, sound can attract people's attention the most. It can force people's auditory organs to accept the sound, which determines the comparison of auditory art with visual art. Art can more directly affect people's emotions and shock people's hearts. Music can only be expressed by sound and felt by hearing, but this does not mean that when people create and appreciate music, only the parts of the cerebral cortex corresponding to hearing are excited, while other parts are in a state of inhibition. . In fact, musicians not only feel and experience, understand and express life through the channel of hearing, but also use their whole body and mind to feel and experience, which is no different from other types of artists. The difference is that during artistic conception and artistic expression, musicians condense their various personal feelings into auditory images through image thinking, and then express them in specific sound forms. Therefore, the thoughts and emotions expressed in musical works are not simply auditory feelings, but overall feelings. Similarly, when people appreciate music, although they mainly receive auditory stimulation through auditory channels, due to the role of synaesthesia, they may also cause visual images, produce rich and vivid associations and imaginations, and then arouse strong emotions. Reaction, experience the thoughts, feelings and artistic conception expressed by musicians in their works, gain a sense of beauty and be moved by it. One theory is that the expressiveness of music comes from the imitation of human language with expressive elements. Human language uses expression means such as voice, tone, flow, rhythm, and speaking speed to express meaning in conjunction with semantics, while expression means such as timbre, pitch fluctuations, and rhythm speed of music can play the same role as the expression means of language.