Claude Debussy was a renowned French composer who lived in the late 19th and early 20th century. His music was known for its impressionistic style, using unique harmonies and tonalities to create a dreamlike atmosphere. Synonyms for Debussy might include "impressionist composer," "musical innovator," or "pioneer of modern composition." Other adjectives that could describe his work include "dreamy," "ethereal," "poetic," and "evocative." Some might also associate Debussy with the early 20th century artistic movement known as "Art Nouveau," which emphasized intricate, curved designs and the fusion of natural and artistic elements. Overall, Debussy is widely recognized as a master of musical atmosphere and mood.