| Abbreviation | Definition |
|---|---|
| MCH | Music and Computer Help |
| MCIR | Music Copyright Infringement Resource |
| MCL | Most Comfortable Listening |
| MCL | Much Clown Luv |
| MCM | Music City Miracle |
| MCME | Moscow Contemporary Music Ensemble |
| MCMF | Mt Carmel Music Foundation |
| MCMF | Multi Cultural Music Fellowship |
| MCMJ | Master of Ceremony Murder Jesus |
| MCML | Montreal Contemporary Music Lab |
| MCML | Music Contents Markup Language |
| MCMS | Maine Chamber Music Seminar |
| MCMS | Manchester Community Music School |
| MCO | Mahler Chamber Orchestra |
| MCO | Manitoba Chamber Orchestra |
| MCPB | Mesa Caledonian Pipe Band |
| MCR | My Chemical Romance |
| MCRX | My Chemical Romance 10 |
| MCS | Motion City Soundtrack |
| MCS | Music Chord System |