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 the school at Deventer
conducted by the Brethren of the Common Life[?].
He became skilful as a copyist and was thus
enabled to support himself. Later he was ...