| Abbreviation | Definition |
|---|---|
| ATC | Asher Tobin Chodos |
| ATCQ | A Tribe Called Quest |
| ATG | At The Gates |
| ATH | A Todos Horas |
| ATM | All Types of Music |
| ATM | American Time Machine |
| ATMI | Association for Technology in Music Instruction |
| ATMM | Audio Technologies for Music and Media |
| ATOD | A Taste Of Dance |
| ATPL | Airline Transport Pilot Licence |
| ATR | All That Remains |
| ATR | Atari Teenage Riot |
| ATWA | Air, Trees, Water, Animals |
| ATWB | Average Thom White Band |
| ATWE | All Town Wind Ensemble |
| AUM | All Usa Meeting |
| AUMB | Auburn University Marching Band |
| AUMI | Adaptive Use Musical Instruments |
| AUTO | An Urgent Transport Option |
| AV | Amicalement Votre |