What are the characteristics of the musical structure of western classical music?

There are many forms of western classical music, the highest of which is sonata form. Sonata form is a suite composed of three movements, the first movement is usually fast and lively, the second movement is usually slow and lyrical, and the third movement is usually fast and cheerful. In addition, there are different musical structures, such as trilogy, trilogy and tetralogy.

Harmony is a very important part of western classical music. Harmony means that several sounds are issued at the same time, emphasizing the relationship between sounds. Vertical and horizontal relationship is that several voices sound at the same time. The study of "harmony" in the west was as early as the seventeenth and eighteenth centuries, and "harmony" is the combination of sound science and musical aesthetic experience. If western music lacks "harmony", its vitality and existence value will be much weaker.