polytonalism
/ˌpɑliˈtoʊnəˌlɪzəm/
noun
- A musical technique that uses two or more different keys at the same time.
- The composer's use of polytonalism gave the piece a unique, dissonant sound.
- Many 20th-century composers experimented with polytonalism to create complex harmonies.
- Students in music theory class studied polytonalism by analyzing works by Stravinsky and Milhaud.