| Abbreviation | Definition |
|---|---|
| MLAF | My Little Austrian Friend |
| MLAO | Music Literature and Arts Outreach |
| MLBB | Maple Leaf Brass Band |
| MLC | Music Leadership and Communication |
| MLC | Music Learning Community |
| MLC | Music Licensing Collective |
| MLFM | Mother Lode Friends of Music |
| MLIB | McLeod Lake Indian Band |
| MLLB | Mary Louise Lee Band |
| MLSO | Main Line Symphony Orchestra |
| MLWE | Manitowoc Lakeshore Wind Ensemble |
| MM | Maelzel's Metronome |
| MM | Metronome Marking |
| MM | Micro Metronome |
| MM | Mitch Miller (Sing Along with Mitch) |
| MM | Modest Mouse |
| MMA | Music Modernization Act |
| MMAD | Musicians Making a Difference |
| MMAP | Music Media and Place |
| MMB | Michigan Marching Band |