The influence of the symbolist poetry and the impressionist painting on Debussy's music is stronger than the influence of the music of his era. This close relation is not limited to the fact that Debussy composed many pieces on symbolic poems; there exists a similarity of design between symbolist poetry and Debussy's music. Both are craving to create their aesthetic language with components that are freed from the conventional meaning of a priori systems; they aim the aesthetic effect to be born out from the inner qualities of the components and their relationships. In this essay, first, the revolutionary aspects of symbolism will be elucidated using poetry analysis, and then the traces of these issues will be examined in Debussy's musical language. For the sake of non-professional readers, the musical and poetic terminology used in the essay will be limited to a basic level. The last part of the article is reserved for a survey of findings on the selected works by Debussy.