| Abbreviation | Definition |
|---|---|
| MSPB | Midlothian Scottish Pipe Band |
| MSR | March, Strathspey, and Reel |
| MSR | Music Safety Research |
| MSS | Musician Supreme And Sensational |
| MSSB | M Shanghai String Band |
| MSSI | Music Start Search Installation |
| MSSL | Music Students Service League |
| MSSN | Music Science |
| MSSO | Moores School Symphony Orchestra |
| MSSO | Moscow State Symphony Orchestra |
| MSTF | Mediterranean Summer Tango Festival |
| MSV | Music Speaks Volumes |
| MSWO | Marylebone Symphonic Wind Orchestra |
| MSYM | Maine Summer Youth Music |
| MSYO | Marin Symphony Youth Orchestra |
| MSYO | Modesto Symphony Youth Orchestra |
| MTA | Music Therapist Accredited |
| MTAG | Music Therapy Association of Georgia |
| MTAI | Music Thanatology Association International |
| MTB | Made The Band |