Music in the classical period is characterized by its great theme, rationality, grandeur, logic and rigorous structure, with theme and harmony style as the leading factor.

The "Vienna Classical Music School" represented by Haydn, Mozart and Beethoven achieved the highest artistic achievements in the classical period. The creation era of Vienna classical music school coincides with the period of "ideological enlightenment" in Europe. Enlightenment advocates rationality, science, experience, individual liberation and equal rights, and opposes theocracy, feudal privilege and feudal hierarchy. These progressive ideas have had a positive impact on the creation of three composers. In addition, the French bourgeois revolution in the18th century brought profound changes to Beethoven's thought and creation.