The third principle, contextual asymmetry, relates to the order in which the chords occur in a particular musical example. It suggests that two successive chords are related more closely when the first chord is out of context and the second chord is in context than when the first chord is in and the second chord is out. The strength of contextual asymmetry is a function of the context key and the keys of which the chords could be a part. Perceptual distance decreases as the second chord moves closer to the context key and the first chord moves further from it. As an example, in C major, movement of a D major triad to a G major triad results in a greater perceptual similarity between the two triads than the opposite movement, G to D. If, in the second case, the chords are made parallel minor chords, so that a G-Bb-D triad moves to D-F-A triad, the distance decreases.
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