Introduction: It plays three roles: prompting speed, prompting tonality, and prompting emotion. Therefore, only using an introduction that can satisfy these three functions is considered qualified, but this kind of introduction has the least characteristics. Without personality, the role of expanding the space of musical expression is not obvious.
The status of the introduction is a subordinate part other than the main body of the music, so it is dispensable and does not affect the performance of the main music. However, a good introduction can greatly expand the overall performance of the music, so the introduction The types and writing methods can be diverse.
Coda: The end of a piece of music, used to extend the unfinished meaning and enhance the sense of ending.
Extended information
The material of the introduction can be either old material or brand-new material. The most common method is to repeat the last sentence or the climax sentence, but this method is not creative. It is very clever to extract a motive of the main paragraph and develop it into an introduction independently. However, using a completely new material to make an introduction is very clever. , this method is also relatively common, and the effect is also very good. If there are wonderful sentences, then the expressive effect of this introduction will be more than the main paragraph. There are many such works.
The termination of the introduction can be either open or closed. The so-called open type means that the introduction does not fall on the main chord. This type of introduction often enters the main chord in the following main section. The introduction and the main section are tightly connected together, making the music appear more compact; and the other type is the introduction. It falls on the main chord, forming a complete section, and the main section starts again. This kind of music structure has clear boundaries, the stages of emotions are clearer, and the music appears quieter.