I only analyze this sentence in a Western context. The phrase "music is the art of time" first came from page 107 of the book "Aesthetics, or the Science of Beauty" written by Polish writer Liebert in 1849. He divided art into three major categories and nine subcategories as follows: 1. Spatial art - formal or visual art (1) Architecture - beauty (2) Sculpture - truth (3) Painting - goodness 2. The art of time - narrative or auditory art (1) Music - beauty (2) Poetry - truth (3) Rhetoric (also called speech) - goodness 3. The art of living - social Art (1) Idealization of nature (various abilities to transform nature) - beauty (2) Aesthetic education - truth (3) Idealization of society (philosophy and other humanities) - goodness This method of art classification Very popular in the 19th century. Wladyslaw?6?1 Tatarkiewicz made a note in his discussion: The so-called art of space is the art that unfolds or develops in space; the art of time is the art that unfolds or develops in time; life The art of art is the art that unfolds or unfolds in life. In 1906, the German esthetician Desois classified music only into one category: abstract, creative time art in his "Art Classification List". At the same time, art as time consists of music (abstract) and poetry and dance (concrete). By this time rhetoric and poetry had merged. After World War II, the aesthetic community gradually gave up classifying art. In the new post-war world, academia adopted an academic attitude of “all or nothing”. Until the 1970s, the birth of contemporary visual art gradually eliminated the classification rules based on art materials and art forms. Then this classification method based on space, time and life or shape, sound and form is no longer applicable to various contemporary art works. In the former, we divide art according to the place where it occurs. That is to say, music must use time as its place of occurrence, and music cannot exist without time; similarly, paintings and sculptures must use space as its place of occurrence, and they cannot exist without space. The definition of "time art" is as mentioned above: some kind of art that must take place in time.