| 554. Robert Kearns | Bass | 1 |
| 554. Robert Plant and Alison Krauss | Featured Artist | 1 |
| 554. Robert Stillman | Saxophone | 1 |
| 554. Robert Taylor | Drums | 1 |
| 554. Roberta Leono | Tambor Alegre | 1 |
| 554. Roberto Fonseca | Piano | 1 |
| 554. Roberto Lange | Guitar, Vocals | 1 |
| 554. Roberto Lorenzo | Trombone | 1 |
| 554. Roberto Verástegui | Arrangements, Keys, Piano | 1 |
| 554. Roberto Vizcaino Jr. | Percussion | 1 |
| 554. Roberts | Violin | 1 |
| 554. Robin Baytas | Drums | 1 |
| 554. Robin Bramlett | Bass | 1 |
| 554. Robin Dann | Vocals | 1 |
| 554. Robin MacMillan | Drums | 1 |
| 554. Robin Mullarkey | Bass, Percussion, Vocals | 1 |
| 554. Robin Olson | Featured Artist | 1 |
| 554. Robin Vining | Guitar, Vocals | 1 |
| 554. Rocco Nigro | Accordion, Audio | 1 |
| 554. Rocco Palladino | Bass | 1 |
| 554. Roddy Ricch | Keys, Vocals | 1 |
| 554. Rodney Crowell | Featured Artist | 1 |
| 554. Rodrigo Amarante | Featured Artist | 1 |
| 554. Rodrigo Avendano | Keyboards | 1 |
| 554. Roger "Jooseondrums" Benford | Drums | 1 |