The main article for this category is Music theory.

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Music theory is a set of systems for analyzing, classifying, and composing music and the elements of music. Narrowly it may be defined as the description in words of elements of music, and the interrelationship toward the notation of music and performance practice. Broadly, theory may be considered any statement, belief, or concept of the music (Boretz, 1995). Thus academic study of music is called musicology.