| Abbreviation | Definition |
|---|---|
| ABOB | A Band Of Brothers |
| ABPB | A Birthday Party Band |
| ABPB | Alloa Bowmar Pipe Band |
| ABPK | Atombombombpocketknife (band) |
| ABR | August Burns Red |
| ABRB | As Blood Runs Black |
| ABRSM | Associated Board of Royal School of Music |
| ABRSM | Associated Board of Royal Schools of Music |
| ABRSM | Associated Board of the Royal Schools of Music |
| ABRSM | Association of British Royal Schools of Music |
| ABSA | Australian Barbra Streisand Association |
| ABSM | Associate of the Birmingham School of Music |
| ABT | Advanced Bass Technology |
| AC | Acapella Choir |
| AC | Adult Contemporary |
| AC | Almost Country |
| AC | Amplifier Combo |
| ACAM | Angelica Center for Arts and Music |
| ACCA | Amsterdam Catalogue of Composition Algorithms |
| ACCB | Armadale City Concert Band |