| Abbreviation | Definition |
|---|---|
| ANDVT | Advanced Narrowband Digital Voice Terminal |
| ANIM | Afghanistan National Institute of Music |
| ANNE | Artificial Neural Network Ensemble |
| ANUS | A New Underground Sound |
| AO | Accompaniment Only |
| AOD | Assembly of Dust |
| AOIB | Army of in Between |
| AOL | Archers Of Loaf |
| AOMG | Above Ordinary Music Group |
| AOMS | Acoustic Outfitters Music Shop |
| AONO | Always Outnumbered Never Outgunned |
| AOSM | Academy of Sacred Music |
| AOTL | All of the Lights |
| AOTP | Army of the Pharaohs |
| AP4 | Audio Players 4 |
| APAB | Adjustable Pulmonary Artery Band |
| APAM | Archive of Popular American Music |
| APB | All Purpose Band |
| APCMA | Aboriginal Peoples Choice Music Awards |
| APE | Andy Partridge Experiments |