Polytonality
[pol-ee-toh-nal-i-tee] /ˌpɒl i toʊˈnæl ɪ ti/
noun, Music.
1.
the use of more than one key at the same time.
/ˌpɒlɪtəʊˈnælɪtɪ/
noun
1.
(music) the simultaneous use of more than two different keys or tonalities
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