twelve-tone music <p>A body of musical compositions created since the early part of the 20th century created using the twelve-tone system attributed to Arnold Schoenberg. Generally twelve-tone music is considered a subset of serial music, but there is some disagreement on this.</p> <p>Source: Art &amp; Architecture Thesaurus</p> <p>http://vocab.getty.edu/page/aat/300266055</p>