The reasons are as follows: a brisk rhythm can enhance the vitality and movement of dance, and light and regular music can promote the coordination and cooperation among dancers.

1. A brisk rhythm can enhance the vitality and sense of movement of dance: it can help dancers better show their sense of rhythm and rhythm. In addition, fast-paced music can also stimulate the excitement of the audience, thus increasing the ornamental value of dance.

2. Light and regular music can promote the coordination and cooperation among dancers: it makes the whole team more tacit, and the music is too complicated and harsh, which will lead to the dancers' failure to cooperate and affect the whole performance effect.