B-BX Philosophy, Psychology, Aesthetics, Religion
C-CT Auxiliary Sciences of History (History of Civilization, Archaeology, Biography, etc.)
D-DX World History and History of Europe, Asia, Africa, Australia, New Zealand, etc.
E-F History of the Americas
G-GV Geography, Anthropology, Recreation
H-HX Social Sciences
K-KZ Law
L-LT Education
ML1-3930 Literature on music
ML1-5 Periodicals. Serials
ML12-21 Directories. Almanacs
ML25-28 Societies and other organizations
ML29-31 Special collections
ML32-33 Institutions
ML35-38 Festivals. Congresses
ML40-44 Programs
ML45 Circulars and advertisements
ML46 Scrapbooks
ML47-54.8 Librettos. Texts. Scenarios
ML55-89 Aspects of the field of music as a whole
ML93-96.5 Manuscript studies and manuscripts
ML100-109 Dictionaries. Encyclopedias
ML110-111.5 Music librarianship
ML112-112.5 Music printing and publishing
ML112.8-158.8 Bibliography
ML159-3785 History and criticism
ML159-161 General works
ML162-197 By period
ML198-360.6 By region or country
ML385-429 Biography
ML430-458 Composition and performance
ML459-1380 Instruments and instrumental music
ML1400-3275 Vocal music
ML3300-3351 Program music
ML3400-3465 Dance music
ML3469-3541 Popular music
ML3544-3776 Folk, national, and ethnic music
ML3780 Music on particular topics
ML3785 Musical journalism
ML3790-3792 Music trade
ML3795 Music as a profession. Vocational guidance
ML3797-3799.5 Musical research
ML3800-3923 Philosophical and societal aspects of music. Physics and acoustics of music. Physiological aspects of music
ML3800 General works
 
ML3805-3817 Physics and acoustics
ML3820 Physiological aspects of music
ML3830-3840 Psychology 
ML3845-3877 Aesthetics
ML3880-3915 Criticism
ML3916-3918 Social and political aspects of music
ML3919-3920 Moral influence of music.  Therapeutic use of music
ML3921-3921.8 Religious aspects of music
ML3922 Music in the workplace
ML3928-3930 Literature for children
MT1-960 Instruction and study
MT1 General works
M2.5 Music study abroad
MT3-5 History
MT5.5-7 Music theory
MT9-15 Printed pedagogical aids
MT9 Examinations, exercises, etc.
MT10 Teachers’ and supervisors’ manuals, etc.
MT15 Charts, diagrams, etc.
MT17 Music in special education
MT18 Music in colleges and universities
MT20-34 Systems and methods
MT35-39 Notation
MT40-67 Composition. Elements and techniques of music
MT68 Improvisation. Accompaniment. Transposition
MT70-74 Instrumentation and orchestration
MT75 Interpretation
MT80 Embellishment
MT82 Memorizing
MT85 Conducting. Score reading and playing
MT87 Community music
MT88 Administration and instruction of vocal groups
MT90-146 Analysis and appreciation of musical works
MT150 Audio-visual aids
MT155 Music theory for children
MT165 Tuning
MT170-810 Instrumental techniques
MT179-258 Keyboard instruments
MT259-338 Stringed instruments. Bowed stringed instruments
MT339-533 Wind instruments
MT539-654 Plucked instruments
MT655-725 Percussion and other instruments
 
MT728-735 Ensembles
MT737 Motion picture accompanying
MT740-810 Instrumental techniques for children
MT820-915 Singing and vocal technique
MT898-915 Vocal techniques for children
MT918-948 School music
MT920-925 Kindergarten
MT930-948 Elementary schools. Junior high schools. High schools
MT949.5 Whistling
MT950 Music to accompany instruction in ballet, folk dancing, gymnastics
MT955-956 Musical theater
MT960 Music in the theater
N-NX Fine Arts
P-PZ Language and Literature
Q-QR Science
R Medicine
T-TX Technology
Z Bibliography