| Collections |
| M1 | | Miscellaneous collections |
| M2 | | Monuments and historical sets |
| M3 | | Collected works of individual composers |
| Solo Instrument |
| M6-14 | | Organ |
| M20-39 | | Piano |
| M40-58 | | Strings |
| M60-64 | | Woodwinds |
| M80-84 | | Brass |
| M105-109 | | Saxophone |
| M110-175 | | Other instruments |
| M125-129 | | Guitar music |
| Chamber Music |
| M177-179 | | Collections |
| M180-299 | | Duets |
| M300-399 | | Trios |
| M400-499 | | Quartets |
| M500-599 | | Quintets |
| M600-699 | | Sextets |
| M700-799 | | Septets |
| M800-899 | | Octets |
| M900-999 | | Nine or more instruments |
| Orchestral Music |
| M1001 | | Symphonies |
| M1002 | | Symphonic poems |
| M1003 | | Suites and variations |
| M1004 | | Overtures |
| Concertos with Orchestra |
| M1005-1006 | | Organ |
| M1010-1011 | | Piano |
| M1012-1018 | | Strings |
| M1020-1027 | | Woodwinds |
| M1028-1033 | | Brass |
| M1034-1042 | | Other |
| Orchestral Music: Miscellaneous Pieces |
| M1045-1060 | | Miscellaneous orchestral pieces |
| String Orchestra Music |
| M1101 | | Symphonies |
| M1102 | | Symphonic poems |
| M1103 | | Suites and variations |
| M1104 | | Overtures |
| Concertos with String Orchestra |
| M1105-1106 | | Organ |
| M1110-1111 | | Piano |
| M1112-1118 | | Strings |
| M1120-1127 | | Woodwinds |
| M1128-1133 | | Brass |
| M1134-1142 | | Other |
| Orchestral Music: Miscellaneous Pieces |
| M1145-1160 | | Miscellaneous orchestral pieces |
| Band music |
| M1201-1270 | | Band Music |
| Big Band, Dance Band, Jazz Ensembles |
| M1366 | | Jazz ensembles |
| Piano Music for Children |
| M1378-1380 | | Piano music for children |
| Dramatic Works |
| M1500-1518 | | Operas, Musicals, etc. |
| M1520-1526 | | Ballets |
| Vocal Ensembles |
| M1528-1529.5 | | Duets, trios, etc. |
| M1530-1537 | | Mixed Chorus with orchestra |
| M1538-1542 | | Men's chorus with orchestra |
| M1543-1546 | | Women's chorus with orchestra |
| M1546.5 | | Children's chorus with orchestra |
| M1547-1570 | | Chorus with piano |
| M1578-1609 | | Unaccompanied chorus |
| Songs |
| M1611-1618 | | With orchestra |
| M1619-1626 | | With piano |
| National Music and Miscellaneous |
| M1628-1677.8 | | United States |
| M1630.18 | | Popular music collections, Fake books |
| M1678-1985 | | Other countries |
| M1990-1998 | | Children's vocal music (secular) |
| Sacred Vocal Music |
| M2000-2007 | | Oratorios |
| M2010-2014 | | Masses |
| M2014.5-2017.6 | | Other liturgical music |
| M2018-2019.5 | | Sacred duets, trios, etc. with orchestral accompaniment |
| M2020-2101.5 | | Chorus |
| Sacred Songs |
| M2102-2108 | | With orchestra |
| M2110-2114 | | With piano |
| Other Sacred Music |
| M2115-2146 | | Hymnals, Liturgy and ritual, Sacred vocal music for children, Gospel songs |
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