Expressionist music seeks to depict subjective emotions rather than objective reality through distortion, exaggeration, and fantasy. It often features dissonance, extreme contrasts in dynamics and texture, and angular melodies. Characteristics include atonality without a tonal center, use of a twelve-tone scale, dissonant harmony, unbalanced rhythm, and polyphonic tone color. Arnold Schoenberg was a pioneering composer who developed dodecaphonic technique of serialism using sets of twelve tones without tonality. He was influenced by German expressionist techniques like atonality.