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.
... Left-wing group formed by Jean-Pierre Lévy[?] in Lyon in 1941. In December 1941 they began to publish Le Franc-Tireur underground newspaper. There were also members ...