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Up to the present moment the musical science explains the fundamental phenomena of harmony, such as sonance and tension, either by the abstract numerical logic in the frequency relations of sounds, or by the individual specifics of perception. And though the regularities of perception of sonance are well-known, their objective reasons exist only at the level of hypotheses, and the phenomenon of tension is still regarded only as a result of the perceptual effects. However, the above-mentioned phenomena are the refl...

The problem of the symmetry of key relationship is one of specific problems in the theory of music which has a great urgency for studying of tonal music of Modern times. Opened by english musicologist E. Prout it gained the development in works of the soviet scientists (I. V. Spossobin, L. M. Rudolf, A. N. Dolzhanskiy, Yu. N. Tyulin, M. A. Iglitskiy, Yu. G. Kohn, L. A. Mazel, S. S. Grigoryev, Yu. N. Kholopov). The studying of this problem led to understanding of a divergence between known theories and the real pra...