Franz Joseph Haydn is one of the representative figures of the Viennese Classicism Style. He made a great contribution to the final foundation of the Classicism Style. In his career of the music composition, the foundation of the Classicism Style generally went through three stages. Focusing on the influence of the social and historical background on the transformation of his music style, this paper will make a comparison between Haydn's string quartet and symphony in the different stages. The purpose of the paper is to give a ...