Secular Vocal Music
M1500: Operas & Musicals, full score
M1503: Operas & Musicals, piano-vocal score
M1505 - M1508: Opera & Musical excerpts (full score, piano-vocal score)
M1510 - M1527: Other dramatic works (e.g., film)
M1529 - M1529.5: Duets, trios, etc.
M1611 - M1618: Songs with orchestral accompaniment
M1619 - M1998: Songs with non-orchestral accompaniment or no accompaniment
M1619 - M1620: Collections of songs
M1621 - M1621.3: Separately published songs
M1621.4: Song cycles
M1990 - M1998: Secular music for children
Sacred Vocal Music
M2018 - M2019.5: Duets, trios, etc.
M2102 - M2108: Songs with orchestra accompaniment (full scores, piano-vocal versions, arrangements)
M2110 - M2196: Songs with non-orchestral accompaniment or no accompaniment
M2110 - M2112: Collections of songs
M2113 - M2113.2: Separately published songs
M1621.4: Song cycles
M2190 - M2196: Sacred vocal music for children
Bibliographies
ML128.S2: Sacred vocal music bibliographies
ML128.V7: Vocal music bibliographies
General
ML1400 - ML1460: General works, vocal music by period, vocal technique
Secular Vocal Music
ML1600 - ML2881: Books on secular vocal music by historical period and region, song forms/types, cantatas, solo songs, part songs
Sacred Vocal Music
ML2900 - ML3275: Books on sacred vocal music by historical period and region, forms and types
MT820 - MT823: General singing technique (physiology, voice care, history of vocal studies)
MT825 - MT853: Methods, by language
MT855 - MT916: Specific techniques/skills
MT870: Sight-singing
MT875: Chorus/part-singing
MT883: Diction
MT898: Vocal techniques for children