Synaesthesia refers to a psychological phenomenon in which one feeling causes other feelings. Synaesthesia is an emotion that human beings have. For example, depth refers to the height of space, and sinking refers to the weight of objects. When these two words are used to describe hearing, the word itself is the product of synaesthesia.
Synaesthesia is an innate and instinctive sensory response. Music art is mediated by the psychological reaction mechanism of synaesthesia, which can make us feel the feelings beyond hearing, such as images, scenes, emotions, emotions and philosophies, so as to mobilize synaesthesia to understand music.
In fact, music is expressed through synaesthesia. Composers use synaesthesia to choose and organize sounds and express what they want to express, and the audience also feels the composer's expression intention in the sound effect under the same psychological reaction mechanism. According to the correspondence of synaesthesia, the transmission of sadness in music should be characterized by bass, slowness and dullness in form.
The characteristics of sad music: minor style, dissonance, slow speed, bass area, downward pitch, short interval and so on. Sad music has the function of emotion, which can make individuals feel their sadness more deeply. Sad music also has social function, which can bring a sense of companionship and comfort to individuals, or bring a sense of social connection to individuals by arousing the imagination of the theme of intimate relationship.