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.
... to sign the Truce of Crepy[?]. Charles later signed a humiliating treaty with the Ottomans, to gain him some respite from the huge expenses of their war.
In 1545 the ...