1. A musical form (musical section) is the smallest structure in a complete musical form. It can be composed of one phrase, two phrases, three or more phrases. Generally, there are obvious terminologies, which can express a complete or relatively complete idea of music.

2. One-part musical form: It consists of two parts, each of which consists of a piece. In general, the two parts are related to each other in music materials.

3. Single trilogy: It consists of three parts, and each part is basically a passage. There are two kinds of single trilogy. The first one is a single trilogy with reproduction. The second is a single trilogy without reproduction.

Extended information:

A musical form (musical segment) is the smallest structure in a complete musical form. The two-part musical form consists of two parts, each of which consists of a passage. The trilogy is composed of three parts, and each part is basically a passage.

a paragraph, also known as a musical form or a musical piece, is equivalent to a paragraph in a literary work. It is the smallest structure in a musical piece, including only one or several phrases, and can express a relatively complete musical idea. Generally, it can be used to form a part of other musical forms, but sometimes it can become a complete song or music by itself. For example, the song "The Rising Sun on the Grassland" is composed of a single musical piece.

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