| Abbreviation | Definition |
|---|---|
| APE | Autothority Performance Engineering |
| APF | American Percussion Festival |
| APHF | Asia Pacific Harmonica Festival |
| APHG | Ariel Pink's Haunted Graffiti |
| APM | Asian Pop Music |
| APMD | All Pigs Must Die |
| APME | Association for Popular Music Education |
| APO | Armenian Philharmonic Orchestra |
| APO | Auckland Philharmonia Orchestra |
| APOBA | Associated Pipe Organ Builders of America |
| APTL | Alnico Pro Tele Lead |
| APTR | Alnico Pro Tele Rhythm |
| AQAP | As Quality As Possible |
| ARCM | Associate of the Royal College of Music |
| ARCO | Amplified Repertory Chamber Orchestra |
| ARCP | Artist Royalty and Copyright Payment |
| ARDM | Avery Ranch Dance Music |
| ARIA | Accessibility Remoteness Index Of Australia |
| ARIA | Australian Record Industry Awards |
| ARIMS | Arthur Rubinstein International Music Society |