Claude Achille Debussy was a French composer who lived from 1862 to 1918. He is known for his innovative and influential contributions to the world of music, particularly in the realm of impressionist music. Debussy's compositions often featured unique harmonies, subtle tonal colors, and a departure from traditional musical forms. Some of his most famous works include "Clair de Lune," "La Mer," and "Prelude to the Afternoon of a Faun." Debussy's music continues to be celebrated for its beauty and originality, and he is considered one of the most important figures in the history of Western classical music.