twelve-tone system

Từ điển WordNet v3.1 - WordNet Dictionary

noun

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)
• Syn:
twelve-tone music, 12-tone music, 12-tone system
• Hypernyms:
serialism, serial music