| Abbreviation | Definition |
|---|---|
| RJO | Reunion Jazz Orchestra |
| RJP | Raging Jazz Project |
| RJW | Rosy Jack World |
| RJX | Ron Jeremy Explosion |
| RK2 | Rude Knot To |
| RKB | Rocky King Band |
| RKO | Robbie Krieger Organization |
| RKT | Rude Knot To |
| RLAB | Roll Like A Buffalo |
| RLB | Rachel Leyco Band |
| RLE | Respect, Loyalty, Entertainment |
| RLPO | Royal Liverpool Philharmonic Orchestra |
| RLQ | Ralph Lecessi Quartet |
| RMB | Royal Marine Band |
| RMBS | Royal Marines Band Service |
| RMC | Recreational Music Center |
| RMC | Rock Music Club |
| RMC | Roundtable of Musical Craftsman |
| RMCB | Rocky Mountain Concert Band |
| RMCG | Rec Music Classical Guitar |