| MU |
| Name | Number of records |
| Multisongs, Inc. | 129 |
| Multnomah Press | 182 |
| Mummy Dust Music, Ltd. | 176 |
| Munchkin Music | 494 |
| Mundo Hispano, Editorial | 254 |
| Muppets, Inc. | 674 |
| Muscle Shoals Sound Publishing Company, Inc. | 64 |
| Music 70 Music Publishers | 298 |
| Music 70 Music Publishers, Inc. | 207 |
| Music City Music, Inc. | 764 |
| Music Corporation of America | 314 |
| Music Corporation of America, Inc. | 3373 |
| Musicians Publications | 97 |
| Music of the World | 262 |
| Music of Windswept | 752 |
| Music Sales Corporation | 376 |
| Music Sales Corporation. | 745 |
| Music Sales Corporation. Amsco Publications | 169 |
| Musicways, Inc. | 67 |
| Musicworks | 206 |
| Musik Unserer Zeit Verlag, G.m.b.H. | 190 |
| Mute Song | 241 |
| Mute Song, Ltd. | 306 |
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