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.
... in 1547. At the Diet of Augsburg[?] in 1547 he created a doctrinal compromise that he felt Catholics and Protestants alike might share. In 1548 he made the Seventeen ...