Polytonality series, part 4 - common ground between Vincent Persichetti and Jerry Bergonzi: https://glennwhite.net/blog/polytonality-4

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Opinions About Polytonality 4 – The Spectrum - Glenn White

The degree to which polytonality is perceived is often governed by the relationship(s) between the keys that are presented. Vincent Persichetti elaborates: "The fundamental quality of polytonal texture is determined by the key relationship set up by the tonics. In major-key combinations, a polytonal order of tension from consonant to dissonant is secured by combining

Glenn White - saxophonist, composer
Opinions About Polytonality 3 – Momentum and Motive - Glenn White

In the following examples, repeated melodic fragments (motives) factor importantly in how new keys are introduced into an established tonal environment. Further, one of the tonal environments (either the established or the newly introduced) can be purposefully ambiguous, suggesting perhaps two or more tonal possibilities. In what is one of Lennie Tristano’s most widely acclaimed

Glenn White - saxophonist, composer