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.
... two-thirds elected after the next four-year period. Beside the Senate there is the Chamber of Deputies or Câmara dos Deputados of 513 seats, whose members are elected by ...