| Abbreviation | Definition |
|---|---|
| RBO | Rich Bobinski Orchestra |
| RBR | Region Band ring |
| RBSG | Rhythm Band Soprano Glockenspiel |
| RBSG | Rubber Band Submachine Gun |
| RBU | Rasputin's Big Unit |
| RBU | Rock Band Unplugged |
| RBVR | Rock Band VR |
| RCA | Recording Council Association |
| RCA | Rodeo Cowboys Association |
| RCA | Root Canal Analysis |
| RCBB | River City Brass Band |
| RCCB | Rockland County Concert Band |
| RCE | Raffles Chamber Ensemble |
| RCJ | River Cities Jazz |
| RCJ | Rosewood Concert Jumbo |
| RCK | Rock |
| RCM | Royal Conservatory of Music |
| RCMH | Radio City Music Hall |
| RCMS | Ridgecrest Chamber Music Society |
| RCMT | Royal Conservatory of Music Toronto |