| Abbreviation | Definition |
|---|---|
| HMSM | Happy Music Sad Music |
| HMSO | Hammarskjold Middle School Orchestra |
| HMSU | Hard Music and Sounds United |
| HMT | Haskell Music Theory |
| HMT | His/Her Majesty's Theatre |
| HMT | Houdini Music Toolset |
| HMT | Hwange Music Team |
| HMTS | Housatonic Musical Theatre Society |
| HMV | Halo Music Video |
| HMV | His Master's Voice |
| HMW | Heavy Metal Warrior |
| HNAS | HIrsche Nicht Aufs Sofa (German band) |
| HNCM | Hanoi National Conservatory of Music |
| HNX | Hot N' Xtreme |
| HOBO | House Of Blues Orlando |
| HOH | House Of Horses |
| HOI | Heart Of Illinois |
| HOJO | Howard Jones |
| HOME | Helping Our Music Evolve |
| HONJ | Heart Of New Jersey Chorus |