The introduction and ending of music had a unique function and were indispensable parts of music. An introduction is usually the beginning of a piece of music used to express the theme or emotion of the piece and is usually short to arouse the interest of the audience. The role of the introduction was to lead the audience to the next part of the song and lay the foundation for the development of the song. The coda was the end of the piece, used to express the ending or emotion of the piece, and was usually longer. The role of the coda was to end the song and leave a good impression on the audience. The ending could also be used as a conclusion to the performance of the song. The introduction and the ending played a very important role in music. They could add color to the music and make it more lively and interesting.