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In many Western styles, it is desirable to find efficient, independent voice leadingsbetween transpositionally or inversionally related chords. The progressions in Fig. 1 are allof this type (Movie S3). A chord can participate in such progressions only if it is nearlysymmetrical under transposition, permutation, or inversion (16). I conclude by describingthese symmetries, explaining how they are embodied in the orbifolds’ geometry, andshowing how they have been exploited by Western composers.
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