| Abbreviation | Definition |
|---|---|
| RSME | Research Studies in Music Education |
| RSMG | Russell Simmons Music Group |
| RSNO | Royal Scottish National Orchestra |
| RSO | Reading Symphony Orchestra |
| RSO | Regina Symphony Orchestra |
| RSO | Ridgefield Symphony Orchestra |
| RSO | Roanoke Symphony |
| RSO | Roanoke Symphony Orchestra |
| RSO | Rockford Symphony Orchestra |
| RSPO | Royal Stockholm Philharmonic Orchestra |
| RSSM | Royal Stage School of Music |
| RSTB | Raven Sings The Blues |
| RSW | Rosa String Works Band |
| RT | Reverberation Time |
| RT | Ring Tone |
| RTAZ | Rooster Teeth Arizona |
| RTB | Roll The Bones |
| RTBB | Ricky Tick Big Band |
| RTO | Really Terrible Orchestra |
| RTX | Royal Trux |