Claude Debussy was a French composer who lived from 1862 to 1918. He is considered one of the most important figures in music during the late 19th and early 20th centuries, and is known for his impressionistic style of composition. Debussy's works are often characterized by their dreamy, ethereal soundscapes and use of non-traditional harmonic progressions. He is best known for his orchestral works such as 'La Mer' and 'Prelude à l'après-midi d'un faune, ' as well as his piano pieces such as 'Clair de Lune' and 'REVERIE.'