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.
... modern-day Mozambique, Arab-controlled territory on the East African coast that was part of the Indian Ocean's network of trade. Having got that far, da Gama was able ...