Definition
Arnold Schoenberg (1874-1951) was an Austrian-American composer, music theorist, teacher, and painter. He is known for his development of the twelve-tone technique. This technique involves composing with all twelve notes of the chromatic scale in a structured order, avoiding traditional tonal centers. Schoenberg's music often sounds dissonant and complex to those unfamiliar with it. He was a pivotal figure in the development of atonal music. Think of him as a musical revolutionary.