Definition of "polytonal" []

• That uses two or more tonalities simultaneously (adjective)

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• "The first half ended with the Ives Sonata No. 4, an unruly pastiche of hymns, marches and folk songs in a polytonal texture, which simply stopped mid-phrase."
• "Here's the group's first TV appearance; the polytonal divergence with the accompaniment notwithstanding, it's quite a first impression:"
• "The big polytonal palaver of folk-tunes in Biber's "Battalia.""