The Twelve-tone system is an example of what kind of music?
Noun. 1. twelve-tone music-a type of serial music introduced by Arnold Schoenberg; uses a tone row formed by the twelve semitones of the chromatic scale (and inverted or backward versions of the row). 12-tone music, 12-tone system, twelve-tone system.welve-tone music-a type of serial music introduced by Arnold Schoenberg; uses a tone row formed by the twelve semitones of the chromatic scale (and inverted or backward versions of the row).