Debussy's music is characterized by its use of impressionism, a style of music that seeks to create a mood or atmosphere rather than tell a story or convey a specific message. Debussy's music is often dreamy and ethereal, and it often makes use of unusual scales and harmonies.
Schoenberg's music, on the other hand, is characterized by its use of atonality, a style of music that does not use a traditional key or tonal center. Schoenberg's music is often dissonant and challenging, and it often requires a new way of listening from the audience.
In addition to their different approaches to tonality, Debussy and Schoenberg also had different approaches to rhythm and meter. Debussy's music is often free-flowing and rubato, while Schoenberg's music is often more strictly rhythmic and metric.
Finally, Debussy and Schoenberg had different approaches to the use of instruments. Debussy's music often makes use of a wide variety of instruments, including non-traditional instruments such as the celesta and the harp. Schoenberg's music, on the other hand, is often more focused on the use of traditional instruments, such as the piano and the violin.
In conclusion, Debussy and Schoenberg were two very different composers with very different approaches to music. Their music continues to be enjoyed by audiences around the world, and it has had a profound influence on the development of Western music.