Impressionism aimed to capture atmospheric impressions rather than depict specific subjects. Key musical impressionists included Claude Debussy and Maurice Ravel, who used non-traditional scales, dissonance, and a non-emotional style. In contrast, expressionism sought to represent inner emotions and experiences through atonal and dissonant music. Important expressionist composers were Arnold Schoenberg, Alban Berg, and Anton Webern, who developed the 12-tone technique. Impressionism used tonal music while expressionism was atonal and dissonant.