Schoenberg, Arnold BrE AmE
(1874–1951) an Austrian ↑ composer who went to the US in 1933. He invented the ‘twelve-tone system’ of writing modern music, in which music is written around a set of twelve notes of a ↑ chromatic ↑ scale . His system has influenced many modern composers. His works include Transfigured Night , Pierrot Lunaire , and an ↑ opera that he did not finish Moses and Aaron .