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192 HOPI SONGS
movement from a fifth to a minor sixth. Thenceforward the boundaries of the melody are ductile and compressible within these double outlines. The combination of intervals shown in the diagram of the inferred basis of mutation is in the main diatonic and is approximately expressed in the staff notation. The exceptional progressions are explained by the context of the melody and confirm the inference that this and not any independent system of harmonic relations determines its course. The European musical consciousness consists essentially in the grasp of the complex of triads shown in the accompanying diagrams of the major and minor modes of the diatonic scale. The two adjacent semitones of 6, in- |
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