Tonality flux refers to the variation or changes in tonal center or tonal quality within a piece of music. It describes how the tonal structure of a composition may shift from one key or tonal area to another, which can create tension, resolution, or a sense of movement. In a broader musical context, tonality flux can involve modulations, changes between major and minor keys, or the use of non-diatonic chords that influence the overall harmonic landscape.
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