| Abbreviation | Definition |
|---|---|
| ARMY | Adorable Representative MC for Youth |
| ARS | American Recorder Society |
| ARS | America's Russian Sensation |
| ARS | Atlanta Rhythm Section |
| AS | American Singer |
| ASAP | Adrian Smith Album Project |
| ASBM | Archdiocesan School of Byzantine Music |
| ASCAP | American Society of Composers, Authors, and Publishers |
| ASCO | Analog Synthesizer Chamber Orchestra |
| ASD | A Skylit Drive |
| ASDC | Advanced Symphony Database Connector |
| ASFB | All Saved Freak Band |
| ASFG | Another Song For A Girl |
| ASG | Amplification of Self Gratification |
| ASG | The Amplification Of Self Gratification |
| ASGR | A Stained Glass Romance |
| ASHIO | All State Honors Intermediate Orchestra |
| ASIO | Asynchronous Streaming Input Output |
| ASJM | American Society for Jewish Music |
| ASL | Aqua Syndrome Live |