Claude Debussy was a French composer who is considered one of the most important figures in the Impressionist movement in music. His music is characterized by its use of color, texture, and innovative harmonies. Debussy's compositions include orchestral works, chamber music, piano music, and songs. 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.'