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Scores and AV are best searched by composer, performer, and/or genre, and limiting to the material type Scores, Audio, or Videos, for example:
►CALL NUMBERS -- BOOKS
►CALL NUMBERS -- SCORES
Works in the Western art music tradition are not generally given separate call numbers that indicate ethnicity, gender, orientation, or place of birth. See the document below of an outline of the Library of Congress Classification System for scores: