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Subclass M
| M1 5000 | Music | |||
| M1-1.A15 | Music printed or copied in manuscript in the United States or the colonies before 1860 | |||
| M1.A5-3.3 | Collections | |||
| M1.A5-Z | Miscellaneous | |||
| M2-2.3 | Musical sources | |||
| M3-3.3 | Collected works of individual composers | |||
| M5-1480 | Instrumental music | |||
| M5 | Collections | |||
| M6-175.5 | One solo instrument | |||
| M176 | Motion picture music | |||
| M176.5 | Radio and television music | |||
| M177-990 | Two or more solo instruments | |||
| M1000-1075 | Orchestra | |||
| M1100-1160 | String orchestra | |||
| M1200-1270 | Band | |||
| M1350-1366 | Other ensembles | |||
| M1375-1420 | Instrumental music for children | |||
| M1470-1480 | Aleatory music. Electronic music. Mixed media | |||
| M1490 | Music printed or copied in manuscript before 1700 | |||
| M1495-2199 | Vocal music | |||
| M1495 | Collections | |||
| M1497-1998 | Secular vocal music | |||
| M1497 | Collections | |||
| M1500-1527.8 | Dramatic music | |||
| M1528-1529.5 | Two or more solo voices | |||
| M1530-1609 | Choruses | |||
| M1611-1624.8 | One solo voice | |||
| M1625-1626 | Recitations with music | |||
| M1627-1853 | Folk, national and ethnic music | |||
| M1900-1985 | Songs of specific groups or on specific topics | |||
| M1990-1998 | Secular vocal music for children | |||
| M1999-2199 | Sacred vocal music | |||
| M1999 | Collections | |||
| M2000-2007 | Dramatic music | |||
| M2010-2017.6 | Choral services, etc. | |||
| M2018-2019.5 | Two or more solo voices | |||
| M2020-2101.5 | Choruses | |||
| M2102-2114.8 | One solo voice | |||
| M2115-2146 | Hymnals. Hymn collections | |||
| M2147-2188 | Liturgy and ritual | |||
| M2190-2196 | Sacred vocal music for children | |||
| M2198-2199 | Popular religious and devotional music | |||
| M5000 | Unidentified compositions | |||
