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In page Music theory:

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Writers on music semiology include Kofi Agawu (on topical theory,[citation needed] Heinrich Schenker,[9][10] Robert Hatten (on topic, gesture)[citation needed], Raymond Monelle (on topic, musical meaning)[citation needed], Jean-Jacques Nattiez (on introversive taxonomic analysis and ethnomusicological applications)[citation needed], Anthony Newcomb (on narrativity)[citation needed], and Eero Tarasti[citation needed].