| Abbreviation | Definition |
|---|---|
| ACME | American Contemporary Music Ensemble |
| ACMF | Arianna Chamber Music Festival |
| ACMF | Australian Country Music Foundation |
| ACMF | Austrian Country Music Federation |
| ACMO | All Campus Musical Organization |
| ACMP | Asia Computer Music Project |
| ACMP | Associated Chamber Music Players |
| ACMR | American Christian Music Review |
| ACMR | Association for Chinese Music Research |
| ACMS | Artaria Chamber Music School |
| ACMS | Auditorium Chamber Music Series |
| ACO | American Composers Orchestra |
| ACO | Atlantic Classical Orchestra |
| ACO | Australian Chamber Orchestra |
| ACOF | Australian Composers Orchestral Forum |
| ACPG | Anyone Can Play Guitar |
| ACRED | ARM Cloud Retrieval Ensemble Data |
| ACRH | Academic Complex Recital Hall |
| ACSO | Association of California Symphony Orchestras |
| ACSO | Atlanta Community Symphony Orchestra |