| Abbreviation | Definition |
|---|---|
| BYFC | Brett Yang Fan Club. (Brett Yang from twosetviolin.com.) |
| BYMT | British Youth Music Theatre |
| BYOB | Bring Your Own Bombs |
| BYOH | Build Your Own Harpsichord |
| BYOM | Bring Your Own Music |
| BYOS | Bring Your Own Sticks |
| BYSM | Buy You Sell Me |
| BYSO | Boston Youth Symphony Orchestras |
| BYSYD | Before You Start Your Day |
| BYYO | Brigham Young Youth Orchestra |
| BZB | Band Zonder Banaan |
| BZN | Band Zonder Naam |
| C | Cello |
| C | Common meter |
| C | Contralto |
| C | Counter-tenor |
| CA | Concert Artist |
| CAAMA | Canadian Association for the Advancement of Music and the Arts |
| CAAS | Chet Atkins Appreciation Society |
| CAD | Clann An Drumma |