| Abbreviation | Definition |
|---|---|
| MOOD | Music Online Open Discussion |
| MOOK | Music of our kind |
| MOP | Master Of Puppets |
| MOP | Music Of Patheticness |
| MOR | Middle Of the Road |
| MOSC | Midland-Odessa Symphony & Chorale |
| MOT | Marching On Together |
| MOTP | March Of The Pigs |
| MOTR | Music in Over the Rhine |
| MOTS | Music of the Spheres |
| MOTS | Music Of The Sun |
| MOTUS | Musicians of the Utah Symphony |
| MOTW | Music Of The World |
| MOV | Music On Vinyl |
| MOWM | Musicians Of Western Montana |
| MOY | More Oldies of Yesteryear |
| MP | Mayday Parade |
| MP | Mezzo Piano |
| MP | Music Positive |
| MP3 | MPEG (Motion Picture Experts Group) Layer-3 |