Secular Vocal Music
| Operas and Musicals | |
| M1500 | Scores (full) |
| M1503 | Piano-vocal scores |
| M1505–1508 | Excerpts (with original or arranged accompaniment) |
| Other Dramatic Music | |
| M1510–1518 | Incidental music |
| M1520–1526 | Ballets |
| M1527 | Motion picture, radio, and television music |
| M1528–1529.5 | Duets, trios, etc., for solo voices |
| Songs (including arias and solo cantatas):
Orchestral Accompaniment |
|
| M1611 | Collections: full scores |
| M1612 | Collections: piano-vocal scores |
| M1613 | Separate works: full scores |
| M1613.3 | Separate works: other accompaniment |
| M1614 | Separate works: piano accompaniment |
| M1615 | Arrangements: Collections: full scores |
| M1616 | Arrangements: Collections: piano-vocal scores |
| M1617 | Arrangements: Separate works: full scores |
| M1618 | Arrangements: Separate works: piano accompaniment |
| Songs:
Other accompaniment or no accompaniment |
|
| M1619 | Collections (more than one composer) |
| M1620 | Collections: one composer |
| M1621 | Separate works: piano accompaniment |
| M1621.2 | Separate works: unaccompanied |
| M1621.3 | Separate works: accompanied by piano and one other instrument |
| M1621.4 | Song cycles |
| M1622 | Vaudeville, music-hall songs, etc. |
| M1623 | Accompaniment of one other instrument: Collections |
| M1624 | Accompaniment of one other instrument: Separate works |
| M1625–1626 | Recitations with music |
| M1627–1853 | National songs (solo songs and part-songs) |
| M1630.18 | Popular music collections |
|
M1900–1978 |
Songs (solo songs and part-songs) of groups and schools or about special subjects |
| M1990–1998 | Secular music for children |
Sacred Vocal Music
| M2018–2019.5 | Duets, trios, etc., for solo voices |
| Songs with orchestra, etc. accompaniment | |
| M2102 | Collections |
| M2103 | Separate songs: Full scores |
| M2103.3 | Separate songs: Other accompaniment |
| M2104 | Separate songs: piano-vocal scores |
| M2105–2108 | Arrangements |
| Songs with piano accompaniment | |
| M2110 | Collections (more than one composer) |
| M2112 | Collections (one composer) |
| M2113 | Separate songs: accompaniment of one instrument |
| M2113.2 | Separate songs: unaccompanied |
| M2113.3 | Song cycles |
| M2114 | Special texts: By religion or denomination |
| M2115–2146 | Hymnals: By religion or denomination |
| M2190–2196 | Sacred vocal music for children |
Singing and Vocal Techniques
| MT820 | General works |
| MT821 | Physiology and care of the voice |
| MT823 | History of vocal instruction and study |
| Systems and methods | |
| MT825 | American |
| MT830 | English |
| MT835 | French |
| MT840 | German |
| MT845 | Italian |
| MT850 | Other |
| MT853 | Systems using audio-visual aids |
| Special techniques | |
| MT855 | General works |
| MT860 | Chanting |
| MT870 | Sight-singing |
| MT875 | Chorus and part-singing |
| MT878 | Breathing |
| MT882 | Tone production |
| MT883 | Pronunciation; diction |
| MT885 | Studies and exercises |
| MT890 | Instructive editions; teaching pieces |
| MT892 | Interpretation, phrasing, expression |
| MT893 | Self-instructors |
| MT898–916 | Vocal techniques for children |
Classification Numbers for Books about Vocal Music
| ML128 .S2 | Sacred vocal music bibliographies |
| ML128.V7 | Vocal music bibliographies |
| Vocal music | |
| ML1400 | General works |
| ML1402–1451 | Vocal music (arranged by period then region or country) |
| ML1460 | Vocal technique |
| Secular vocal music | |
| ML1600 | General works |
| ML1602–1651 | By period then region or country |
| ML1700–1751 | Forms and types (general works; by period then region or country) |
| ML2400–2551 | Cantatas and songs: works about both solo songs and part-songs (arranged by period then region or country) |
| ML2600–2670 | Part-songs (arranged by period then region or country) |
| ML2800–2854 | Solo songs (arranged by period then region or country) |
| ML2880–2881 | Christmas songs |
| Sacred vocal music | |
| ML2900 | General works |
| ML2902–2951 | By period then region or country |
| ML2999–3197 | Individual religions and denominations |
| ML3201–3275 | Forms and types(oratorio, cantata, chorale) |
