Overture, main song, and ending.

1. Overture: The overture is the opening part of the music, used to present the theme, emotion and style of the music, and sometimes introduce some story background.

2. Main song: The main song is the main part of the music, including multiple movements or paragraphs, and is the core content of the music.

3. Epilogue: The epilogue is the end of the music. It is used to wrap up the music and give the audience a complete impression of the music.