Claude Debussy was a French composer who lived during the late 19th and early 20th centuries. He is considered one of the most important figures in the Impressionist movement in music. Debussy's music is characterized by its innovative harmonies, use of color and texture, and evocative atmosphere. His compositions include orchestral works, chamber music, piano music, and songs. Some of his most famous works include his orchestral piece 'Prelude to the Afternoon of a Faun,' his piano suite 'Clair de Lune,' and his opera 'Pelléas et Mélisande.' Debussy's music continues to inspire and captivate listeners with its unique and ethereal qualities.