The structure of general popular songs is composed of main songs, chorus, transitional sentences (inserted sentences), popular sentences (memory points), bridges (prologue, door-crossing, interlude) and so on.

The main song can be said to be the content, which is the backbone of every music. The structure of music has a specific Form, which is called form in music theory. Most common songs are AA'BA' Form. A stands for the main song, while paragraph b is the chorus.

Usually, the structure of a song is composed of a prelude, two main songs, a chorus, a door-to-door music, a second chorus and a main song, and an ending music.

For example, in march of the volunteers, the national anthem of the Chinese people, from "We are United as one" to "March forward, March forward, March forward, March forward, March forward". The part of is the chorus.