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Library of Congress Classification System: Music
| M | Music, General including scores |
| ML | Literature about music |
| MT | Music instruction and study |
| M 1-5000 Music |
| M1 .A1-1.A15 | Music copied or printed in manuscript in the United States or the colonies before 1860 | ||
| M1 .A5-2.3 | Collections | ||
| M2-2.3 | Collections of musical sources | ||
| M3-3.3 | Collected works of individual composers | ||
| M3.3 | First editions | ||
| M5-1490 | Instrumental music | ||
| M6-175.5 | Solo instruments | ||
| M176 | Instrumental music for motion pictures | ||
| M176.5 | Instrumental music for radio and television | ||
| M177-990 | Music for two or more solo instruments | ||
| M180-298.5 | Duets | ||
| M300-386 | Trios | ||
| M400-486 | Quartets | ||
| M500-586 | Quintets | ||
| M600-686 | Sextets | ||
| M700-786 | Septets | ||
| M800-886 | Octets | ||
| M900-986 | Nonets and larger combinations of purely chamber music | ||
| M990 | Chamber music for instruments of the 18 century and earlier | ||
| M1000-1075 | Orchestra | ||
| M1100-1160 | String Orchestra | ||
| M1200-1269 | Band | ||
| M1270 | Fife (bugle) and drum music, field music, etc. | ||
| M1350-1353 | Reduced Orchestra | ||
| M1356-1356.2 | Dance orchestra and instrumental ensembles | ||
| M1360 | Mandolin and similar orchestras of plucked instruments | ||
| M1362 | Accordion band | ||
| M1363 | Steel band | ||
| M1365 | Minstrel music | ||
| M1366 | Jazz ensembles | ||
| M1375-1420 | Instrumental music for children | ||
| M1450 | Dance music | ||
| M1470 | Chance competitions | ||
| M1473 | Electronic music | ||
| M1480 | Music with color or light apparatus | ||
| M1490 | Music printed before 1700 or copied in manuscript before 1700 | ||
| M1495-5000 | Vocal music | ||
| M1497-1498 | Secular vocal music | ||
| M1500-1527.8 | Dramatic music | ||
| M1528-1529.5 | Duets, trios, etc., for solo voices | ||
| M1530-1546.5 | Choruses with orchestra or other ensemble | ||
| M1547-1600 | Choruses, part songs, etc., with accompaniment with keyboard or other solo instrument or unaccompanied | ||
| M1608 | Choruses, etc., in tonic sol-fa notation | ||
| M1609 | Unison choruses | ||
| M1610 | Cantatas, choral symphonies, etc., for unaccompanied chorus (secular and sacred) with or without solo voices | ||
| M 1611-1624.8 | Songs | ||
| M1625-1626 | Recitations with music | ||
| M1627-1853 | National music | ||
| M1900-1978 | Songs (part and solo) of special character | ||
| M1985 | Musical games | ||
| M1900-1998 | Secular music for children | ||
| M1999-2199 | Sacred vocal music |
| M1999 | Collections | |||
| M2000-2007 | Oratorios | |||
| M2010-2017.6 | Services | |||
| M2018-2019.5 | Duets, trios, etc. for solo voices | |||
| M2020-2036 | Choruses, cantatas, etc. | |||
| M2060-2101.5 | Choruses, part songs, etc., with accompaniment of keyboard or other solo instrument, or unaccompanied | |||
| M2102-2114.8 | Songs | |||
| M2115-2146 | Hymnals. Hymn collections | |||
| M2147-2188 | Liturgy and ritual | |||
| M2147-2155.6 | Roman Catholic Church | |||
| M2156-2160.87 | Orthodox churches | |||
| M2161-2183 | Protestant churches | |||
| M2184 | Other Christian churches | |||
| M2186-2187 | Jewish | |||
| M2188 | Other non-Christian churches | |||
| M2190-2196 | Sacred vocal music for children | ||
| M2198-2199 | Gospel, revival, temperance, etc. songs |
| M5000 | Unidentified compositions | |
| ML1-3930 Literature on music |
| ML25-28 | Societies on music |
| ML 32-33 | Institutions |
| ML35-38 | Festivals. Congresses |
| ML40-44 | Programs |
| ML47-54.8 | Librettos. Scenarios |
| ML62-90 | Special aspects. Including writings of musicians |
| ML93-96.5 | Manuscripts, autographs, etc. |
| ML100-109 | Dictionaries. Encyclopedias |
| ML110-111.5 | Music librarianship |
| ML112-112.5 | Music printing and publishing |
| ML112.8-158.8 | Bibliography |
| ML113-118 | International | ||
| ML120 | National | ||
| ML132 | Graded lists. By medium | ||
| ML135 | Manuscripts | ||
| ML136-158 | Catalogs. Discography | ||
| ML158.4-158.6 | Video recordings | ||
| ML158.8 | Computer software | ||
| ML159-3775 | History and criticism | ||
| ML162-197 | Special periods | ||
| ML162-169 | Ancient | ||
| ML169.8-190 | Medieval. Renaissance | ||
| ML193-197 | 1601- | ||
| ML198-360 | By region or country |
| ML198-239 | America | ||
| ML240-325 | Europe | ||
| ML330-345 | Asia | ||
| ML348 | Arab countries | ||
| ML350 | Africa | ||
| ML360 | Australia, Oceania |
| ML385-429 | Biography | |
| ML430-455 | Composition | |
| ML459-1380 | Instruments and instrumental music |
| ML465-471 | By period | |||
| ML475-547 | By region or country | |||
| ML475-486 | America | |||
| ML489-522 | Europe | |||
| ML525-541 | Asia | |||
| ML544 | Africa | |||
| ML547 | Australia, Oceania | |||
| ML548 | Jews | |||
| ML549-1093 | Instruments | |||
| ML549.8-649 | Organ | |||
| ML649.8-747 | Piano, clavichord, harpsichord, etc. | |||
| ML749.5-927 | Bowed string instruments | |||
| ML929-990 | Wind instruments | |||
| ML999-1015 | Plucked instruments | |||
| ML1030-1049 | Percussion instruments | |||
| ML1049.8-1091 | Mechanical and other instruments | |||
| ML1091.8-1093 | Electronic instruments | |||
| ML1100-1165 | Chamber music | |||
| ML1200-1270 | Orchestra | |||
| ML1299-1354 | Band | |||
| ML1379-1380 | Electronic music. Computer music | |
| ML1400-3275 | Vocal music |
| ML1499-1554 | Choral music | ||
| ML1600-2888 | Secular vocal music | ||
| ML2900-3275 | Sacred vocal music |
| ML3300-3354 | Program music | |
| ML3400-3465 | Dance music | |
| ML3469-3541 | Popular music | |
| ML3544-3775 | National music | |
| ML3800-3923 | Philosophy and physics of music | |
| ML3845-3877 | Aesthetics | |
| ML3880-3915 | Criticism | |
| ML3928-3930 | Literature for children | |
| MT1-960 Musical instruction and study |
| ML1-5 | History and criticism |
| MT5.5-7 | Music theory |
| MT20-32 | Special methods |
| MT40-67 | Composition. Elements and techniques of music |
| MT58-67 | Forms |
| MT68 | Improvisation. Accompaniment. Transposition. |
| MT70-74 | Instrumentation and orchestration |
| MT73 | Band |
| MT90-146 | Analysis and appreciation of musical works |
| MT95-100 | Opera, ballet, etc. | |
| MT110-115 | Oratorios, cantatas, etc. | |
| MT125-130 | Orchestral music | |
| MT140-145 | Chamber and solo instrumental music | |
| MT146 | Popular music |
| MT170-810 | Instrumental techniques |
| MT180-198 | Organ |
| MT192 | Electronic keyboard instruments |
| MT200-208 | Reed organ | |
| MT220-255 | Piano | |
| MT259-338 | String instruments |
| MT260-279.7 | Violin | ||
| MT280-298 | Viola | ||
| MT300-318 | Violoncello | ||
| MT320-334 | Double bass |
| MT339-533 | Wind instruments |
| MT340-359 | Flute | ||
| MT360-379 | Oboe | ||
| MT380-392 | Clarinet (A, Bb, C, Eb, etc.) | ||
| MT400-415 | Bassoon | ||
| MT418 | Brass instruments | ||
| MT420-432 | Horn | ||
| MT440-456 | Trumpet | ||
| MT460-472 | Trombone | ||
| MT480-488 | Tuba | ||
| MT500-510 | Saxophone |
| MT539-654 | Plucked instruments |
| MT540-557 | Harp | ||
| MT560-570 | Banjo | ||
| MT580-599 | Guitar | ||
| MT600-612 | Mandolin | ||
| MT620-634 | Zither | ||
| MT640-654 | Lute, balalaika, etc. |
| MT655-725 | Percussion and other instruments | |
| MT728-728.3 | Chamber music | |
| MT730 | Orchestra | |
| MT733-733.6 | Band | |
| MT740-810 | Instrumental technique for children | |
| MT820-915 | Singing and voice technique | |
| MT825-850 | Systems and methods | |
| MT855-883 | Special techniques | |
| MT898-915 | Techniques for children | |
| MT918-948 | School music | |
| MT955-956 | Musical theater |