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This research constitutes a detailed study of 5 - 6 voice-leading technique that is often found in music - theoretical literature and in the tonal repertoire. The study aims to prove that this technique is an essential theoretical and analytical concept for understanding the evolution of tonal music. / The first part of this study examines concepts and descriptions of 5 - 6 technique as they appear in the theoretical literature of the eigthteenth and nineteenth centuries and in the writings of Heinrich Schenker and the modern Schenkerian school. The descriptions of 5 - 6 technique in earlier conterpoint, figured-bass and harmony treatises led Schenker and his disciples to place the technique in a much broader context, though even they do not always grasp the full implications of their procedures. / In the light of William Caplin's recent theory of formal functions, (Caplin 1985; 1998), the second part of the thesis in a substantial selection of musical excerpts from the eighteenth through the early twentieth centuries, demonstrates that 5 - 6 technique as a contrapuntal analatycal concept, provides an effective model for understanding the development of chromaticism and the extension of the tonal language at multiple structural levels.

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