| Abbreviation | Definition |
|---|---|
| ROL | Rock Out Loud |
| ROMP | River of Music Party |
| ROMT | Resource Oriented Music Therapy |
| ROMT | Royal Oak Music Theatre |
| ROOTS | Remembering Our Own Tejano Stars |
| ROPA | Regional Orchestra Players Association |
| ROPA | Regional Orchestra Players' Association |
| ROSO | Roll One Smoke One |
| ROTB | Rock On The Beach |
| ROTB | Roll Out The Barrel |
| ROTR | Reggae on the River |
| ROTR | Rock on the Range |
| RP | Rock Pop |
| RPCO | Royal Philharmonic Concert Orchestra |
| RPFM | Ruhrpott Pagan Folk Metal |
| RPM | Revealing Panties Music |
| RPO | Rochester Philharmonic Orchestra |
| RPO | Royal Philharmonic Orchestra |
| RPPO | Rhema Parousia Philharmonic Orchestra |
| RPRF | Reproducing Piano Roll Foundation |