Arnold Schoenberg was a German composer who is widely credited with the invention of Twelve-tone music. Aside from composing he was also a painter, a music theorist, and teacher of Alban Berg, Anton Webern, Hanns Eisler, John Cage, Lou Harrison, and Earl Kim.
Arnold's significant compositions of modern music extend well over 50 years and are thus divided into three periods of time.
During this time Arnold composed in a Romantic and Expressionist vein.
This period is marked by Arnold's abandonment of key centers.
It was here that he developed the dodecaphonic compositional method.