| Abbreviation | Definition |
|---|---|
| ACTOR | Action, Collaboration, Tone, Oration, Rhythm |
| ACWE | Albany City Wind Ensemble |
| ACWE | All Cities Junior Youth Wind Ensemble |
| ACWE | Austin Civic Wind Ensemble |
| AD | Accelerator Delta |
| ADAM | Alternative Dance And Mixer |
| ADAN | All Day, All Night |
| ADB | A Different Beat |
| ADBB | Abu Dhabi Big Band |
| ADD | American Dream Denial |
| ADD | Another Damn Disappointment |
| ADFG | Abdou Dar French Gnawa (band) |
| ADJN | Atlanta Disc Jockey Network |
| ADM | Afro Dance Music |
| ADM | Any Decent Music |
| ADMS | Armidale Drama and Musical Society |
| ADP | Asian Dance Party |
| ADPB | Akron and District Pipe Band |
| ADR | Audio Digital Recording |
| ADSR | Attack, Decay, Sustain, and Release |