Polytonality

Polytonality: the simultaneous use of two or more keys in a musical composition. "The polytonalists appear to claim that the value of their work lies in the significance of the horizontal lines"
1938.The Oxford Companion to Music 406/1

Dissonance: a combination of tones, causing beats and thus producing a harsh effect; also a note which in combination with others produces this effect.

Looking and Listening section

Mark Rothko

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Rothko Biography