| Abbreviation | Definition |
|---|---|
| MPTI | Music Production Technology and Innovation |
| MPWS | Mission Peak Wind Symphony |
| MPZ | Music Program Zero |
| MR | Mid-Range |
| MRB | Mike Renick Band |
| MRB | Mystic Roots Band |
| MRC | Magic Rave Crew |
| MRM | Multi Room Music |
| MRN | Mine Right Now |
| MRQ | Moutin Reunion Quartet |
| MRS | music radio service |
| MRSQ | Music Reference Services Quarterly |
| MRSS | Music Recording Studio Security |
| MS | Mellemfolkeligt Samvirke |
| MS | Metro Station |
| MS | Musical Similarities |
| MSA | Modern Soul Academy |
| MSB | Music Sounding Better |
| MSBA | Mid States Band Association |
| MSBB | Mid Sussex Brass Band |