You asked about the function, um ... I think the biggest function is that the music sounds more compact and continuous, thus highlighting the main theme of dance music. Background analysis ... you can go to Baidu. If you write a paper, write it beautifully.

I will be more responsible. ...

With the rhythm of the left hand, the whole music is more compact, and the beautiful melody is touching. It seems that people are in the vast grassland, watching the children around the grassland dance and sing touching melodies. ...

Like this, exaggerated.