Modern classical music is music written in the 20th century and beyond. Although much of it draws heavily on earlier forms, modern composers also experimented with rejection of long-held ideas; notably, Arnold Schoenberg questioned the traditional notions of harmony with his twelve-tone system[?], and John Cage questioned the very definition of music with his use of chance and found sounds.
... a part of the Allied armed forces. Allies sent three-men teams (codename Jedburgh) - one French, one US or British and one radioman – to organize sabotage before the D-day. ...