polytonal

/ˌpɑliˈtoʊnəl/
adjective
  1. Relating to or using more than one musical key at the same time.
    • Many 20th-century composers experimented with polytonal harmonies.
    • The composer's polytonal piece combined two different keys in a surprising way.
    • The pianist struggled to play the polytonal section because her hands were in different keys.
Antonyms