Who invented he twelve tone system?

The twelve-tone system was invented by Austrian composer Arnold Schoenberg in the early 20th century. This method of composition involves using all twelve notes of the chromatic scale in a specific sequence, or "tone row," which serves as the basis for a musical piece. Schoenberg's twelve-tone technique marked a significant shift in Western music, moving away from traditional tonal harmony. It was a key development in the evolution of serialism and modernist music.