Final answer:
Debussy preferred using Pentatonic, Minor, Chromatic, and Whole-tone scales, each contributing to his signature Impressionist sound.
Step-by-step explanation:
The scales that Debussy liked to use in his compositions are the Pentatonic, Minor, Chromatic, and Whole-tone scales. Claude Debussy was a prominent composer associated with the Impressionist movement in music. His innovative use of scales contributed to his unique sound. The Pentatonic scale, which is based on five notes per octave, is often associated with East Asian music and contributed to the exotic feel in some of his compositions. The Minor scale provided a melancholic and introspective quality. Debussy frequently utilized the Chromatic scale, which includes all twelve notes in the octave, to create fluid and seamless transitions between harmonies. Lastly, the Whole-tone scale, comprised of six notes each a whole step apart, was one of Debussy's favorites for its ambiguous and dream-like sound, challenging the traditional Western tonal system.