| Abbreviation | Definition |
|---|---|
| RCO | Reno Chamber Orchestra |
| RCO | Royal Concertgebouw Orchestra |
| RCS | Radcliffe Choral Society |
| RCSO | River Cities Symphony Orchestra |
| RCT | Reyburn Cyber Tuner |
| RCUE | Royal City Ukulele Ensemble |
| RDAM | Royal Danish Academy of Music |
| RDBM | Reyes Del Bajo Mundo |
| RDM | Reggae Dance Music |
| RDMA | Radio Disney Music Awards |
| RDQ | Richard Davis Quintet |
| RDSO | Red Deer Symphony Orchestra |
| RDX | Reggae Dancehall Xtraordinaire |
| REC | Red Eye Conflict |
| REC | Rhythmic Energy Collaboration |
| REM | Rave English Movement |
| REM | Really Empty Music |
| REMA | Rock Erie Music Awards |
| REMD | Restrained Ensemble Molecular Dynamics |
| RFB | Rockets Favorite Band |