The expressive role of polyphonic music in works is to express several images at the same time, or to express one image or different aspects of an image at the same time.

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Polyphonic music is a kind of "polyphonic music". The work contains two or more (inclusive) independent melodies, which are harmoniously combined through technical processing. Such music is called polyphony. Polyphonic music has a long history. The earliest polyphonic music existed in church chants in the Middle Ages. The choir sang different melodies on different parts when singing carols.

Then the Dutch School of Music in the Netherlands further developed the theory and writing techniques of polyphony. One of the composers, Guillaume Dufay, created the writing and technique of "quadruple harmony". It paved the way for the subsequent counterpoint theory.

The symmetry of polyphonic music "key music". A type of polyphonic music, formerly known as counterpoint. It is based on two, three or four independent tunes with equal artistic significance, which are stacked one after another and performed simultaneously and harmoniously. In the horizontal relationship, the rhythm, intensity, forte, climax, end, start and end of the melody line, and the ups and downs of the melody line of each part are different and each has its own independence; in the vertical relationship, each part has its own independence. Form a good harmonious relationship.

Originally refers to multi-part music composed of several parts, as opposed to single-part music; later refers to music with multiple melodic parts combined according to the law of counterpoint, as opposed to In terms of main tune music. Polyphonic music focuses on the melody of each part, and the parts contrast or complement each other, with no primary or secondary distinction.

Polyphonic music first emerged in Western Europe in the 9th century. Organon developed as its earliest form in the second half of the 15th century and reached its peak in the 16th century. It can be called its golden age. The outstanding representative is Palestri. Na's a cappella singing; by the 18th century, as polyphonic music creation tended to be more complete in structure and technique, J. Bach developed the instrumental fugue form to the extreme and set a model of instrumental polyphonic music technology; in the second half of the 18th century, the dominant position of polyphonic music began to be gradually replaced by tonal music.