The structure and style of music are man-made and processed and reorganized. is correct.

The structure and style of music are created, processed and reorganized by humans. While music may be inspired by natural sounds, they are often subjected to human aesthetic judgment and artistic processing to produce musical compositions with specific forms and structures.

The structure and style of music vary by music type, composer and historical period, but common structures include:

1. Bipartite structure: composed of two different but related parts It is composed of parts, usually AB structure.

2. Three-part structure: It consists of three different but related parts, usually an ABA structure.

3. Musical theme and variation structure: a theme is proposed and multiple changes and interpretations are performed on it.

4. Fugue structure: a complex structure composed of several voices that echo each other and appear interlaced.

5. Procedural structure: The structure of music is arranged in the order of a story, scene or emotional development.

These structures can be realized through repetition, change and transformation, and are reflected in melody, rhythm, harmony, dynamics and timbre.

The characteristics of music structure include:

1. Repetition: Repeated melodies, harmonies or rhythms often appear in music, which helps to form a unified overall structure.

2. Sectionality: Music is usually divided into multiple paragraphs or sections, with obvious transitions or conversions between each section.

3. Sense of layering: Different instruments or parts in music are usually presented at different times or spaces to create a sense of layering and depth.

4. Contrast: Contrasting elements may appear in music, such as speed, height, size, etc., to enhance the expressiveness and emotion of the music.

5. Developmental nature: Music usually has a developmental process, such as the evolution or change of themes, as well as dynamic ups and downs and climaxes.