| Abbreviation | Definition |
|---|---|
| 3LW | 3 Little Women |
| 8675309 | The short version of the phone number from the song of the same name (without the area code) |
| A | Alternative |
| A2IM | American Association of Independent Music |
| A3K | Andre 3000 |
| A7X | Avenged Sevenfold |
| A7X | Avenges Sevenfold |
| AA | Adult Accompaniment |
| AAA | Acoustic And Acapella |
| AAA | Adult Alternative Acoustic |
| AAA | Adult Alternative Album |
| AAA | Adult Alternative Albums |
| AAA | Attack All Around |
| AAAK | As Able As Kane |
| AABB | Above Average Black Band |
| AABC | Australian Army Band Corps |
| AACB | Ann Arbor Concert Band |
| AACE | African American Choral Ensemble |
| AACM | Ali Akbar College of Music |
| AACM | Association for the Advancement of Creative Musicians |