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"The Library of Congress Classification (LCC) is a classification system that was first developed in the late nineteenth and early twentieth centuries to organize and arrange the book collections of the Library of Congress."
-- https://www.loc.gov/catdir/cpso/lcc.html
Library of Congress Classification
The music book collection is arranged by Library of Congress classification. The books are organized into three groups, the main class M and the two subclasses, ML and MT.
M - Music
ML - Literature on music
MT - Instruction and study
More About LoC Classification
In the Library of Congress Classification system, all knowledge is divided into 21 classes, each identified by a single letter of the alphabet (e.g. M for Music). Read more about the LoC Classification system here: http://www.loc.gov/catdir/cpso/lcc.html
Example of a Music Book Call Number
Book:
12 bass arias from the cantatas: an album of flute duets, by Johann Sebastian Bach. Kentfield, CA: Raymond A. Ojeda, 1986.
Call Number:
M289
.B28 C26 1986
- refers to the subject, arranged music for wind instruments
