| Abbreviation | Definition |
|---|---|
| ASMA | Atari SAP Music Archive |
| ASO | Alabama Symphony Orchestra |
| ASO | American Symphony Orchestra |
| ASO | Annapolis Symphony Orchestra |
| ASO | Arkansas symphony orchestra |
| ASO | Atlanta Symphony Orchestra |
| ASO | Austin Symphony Orchestra |
| ASOA | Arlington Symphony Orchestra Association |
| ASOC | Atlanta Symphony Orchestra Chorus |
| ASOL | American Symphony Orchestra League |
| ASOM | A State of Music |
| ASOS | A Saucerful Of Secrets |
| ASR | Attack, Sustain, and Release |
| ASS | Acoustic Solo Show |
| ASTA | American String Teachers Association |
| ASYCO | All-State Youth Choir and Orchestra (Kentucky Baptist Convention) |
| ATAM | Academy of Technology Art and Music |
| ATAT | As Thick As Thieves |
| ATB | America The Beautiful |
| ATB | Andy Timmons Band |