| Abbreviation | Definition |
|---|---|
| CMU | Complete Music Update |
| CMU | Contemporary Music Unit |
| CMV | Christmas Music Video |
| CMVIC | Community Music Victoria |
| CMW | Canadian Music Week |
| CMWC | Cincinnati Music Wellness Coalition |
| CMYC | Center for Music and Young Children |
| CNBLUE | Code Name Blue |
| CNDEW | Can Not Deny Entertainment World |
| CNMF | Charlotte New Music Festival |
| CNMF | Chipping Norton Music Festival |
| CNPB | City of Norwich Pipe Band |
| CNSO | China National Symphony Orchestra |
| CNSO | Czech National Symphony Orchestra |
| CO | Chamber Orchestra |
| COB | Children of Bodom |
| COB | City Of Brass |
| COBHC | Children Of Bodom HateCrew |
| COC | Ceremony Of Carols |
| CODA | Central Oklahoma Director's Association |