French composer Debussy (1862~1918) is considered the founder of modern music and the representative of Impressionism. Impressionist music breaks through the creation patterns and techniques of traditional music, but it is intrinsically related to Baroque music, classicism, and romantic music. In 1905, Debussy composed his masterpiece, the suite "La Mer". He abandoned the emotional factors and philosophy of romantic music and focused on the rendering of atmosphere and the expression of personal impressions and feelings of nature. He boldly reformed his technique, and his works were tonally ambiguous, often using chromatic scales, pentatonic scales, and dissonant chords. The rhythm does not follow the conventional alternating between strong and weak. A mute is often added to the orchestration, and attention is paid to the use of timbre, often giving people a hazy, erratic, and illusory feeling.