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In page Music theory:

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Music semiology (semiotics) is the study of signs as they pertain to music on a variety of levels. Following Roman Jakobson, Kofi Agawu adopts the idea of musical semiosis being introversive or extroversive—that is, musical signs within a text and without.[citation needed] "Topics", or various musical conventions (such as horn calls, dance forms, and styles), have been treated suggestively by Agawu, among others.[citation needed] The notion of gesture is beginning to play a large role in musico-semiotic enquiry.[citation needed]