Why is there such a dynamic change in the last paragraph of Guerrilla Song?

The last paragraph of guerrilla songs has such a dynamic change because of rhythm and melody.

1. As can be seen from the music examples, it mainly imitates the marching pace of troops and is firm and powerful. This rhythm arrangement reflects the author's originality in rhythm. The rhythm of the song is weak, so the sound must be light. Mainly based on the rhythm of 28, strong and powerful. The whole song has only sixteen short bars. The singing is very light at first, and then it becomes stronger and stronger. This kind of singing shows the image of the guerrillas' wit and flexibility. In the second paragraph, the rhythm, melody, mode and tonality of music are in sharp contrast with the first part.

2. From the melody of the song, this song adopts a progressive way to describe the emotional changes of the song. Its melody changed from 333,222 (no food or clothes) to 333,666 (no guns or cannons). When singing this song, we must pay attention to the breathing of phrases, the contrast of emotions, and the changes before and after. At the beginning, the tone is slightly soft, and the next sentence sings the upper level.