The plural form of bitonality; multiple instances or systems of using two tonal centers or keys simultaneously in music.
From 'bitonality' (noun form of bitonal, from 'bi-' and 'tonal') plus the standard plural suffix '-ies'. The term is used in academic music analysis and composition.
When musicologists discuss different bitonalities in a single piece, they're describing how composers layer conflicting tonalities to create tension—it's like visual ambiguity in art where your eye can't decide what to focus on.
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