The theme of change reappears. Changing thematic representation in online cognition of music.

1. Music is a type of art that brings people beauty and happiness.

2. Music is an artistic language that expresses or entrusts people's feelings. It conveys emotions more directly than language, and is always combined with the sense of beauty.

3. Music is an art for people to express, express, and express their feelings. Whether it is singing, playing, or listening, it contains and is related to people's inextricable emotional factors.