Music psychology is an interdisciplinary subject of musicology and psychology, which studies the relationship between music and human psychology, reaction and behavior. Its specific research objects include the auditory cognition of musical elements such as pitch, sound length, timbre, sound intensity, mode, tonality and harmony, and the feeling of musical gestalt structure; The psychological function of music, that is, the effect of music on people's emotions and intelligence, the adjustment of music environment on labor efficiency and the treatment of diseases; The psychological law of music creation, the psychological characteristics of music performance, and the psychological process of music to different appreciators; Composition, detection and cultivation of musical talent. In the past, the relationship between sound and psychology was also the research object of music psychology, such as the relationship between noise and the physical attributes and feelings of isolated music; The fusion and shielding effect of interval on hearing; Synaesthesia problem; The psychological impact of noise on people, etc. With the further differentiation of disciplines, music psychology and sound psychology have been generally regarded as two related and different fields.