| RO |
| Name | Number of records |
|---|
| Roaring Fork Music | 192 |
| Robbins Music Corporation. | 310 |
| Robert Duffey Music | 195 |
| Robert Halmi, Inc. | 266 |
| Robert J. Brady Company | 251 |
| Robischon Publishing | 103 |
| Rock Music Company, Ltd. | 266 |
| Rodale, Inc. | 821 |
| Rodale Press, Inc. | 1906 |
| Roger Dean Publishing Company | 196 |
| Rolling Stones | 171 |
| Rondor Music (London) Ltd. | 1397 |
| Rondor Music (London), Ltd. | 301 |
| Rondor Music, Ltd. | 158 |
| Ron Harris Music | 49 |
| Roper Press, Inc. | 204 |
| Rosen Publishing Group, Inc. | 2197 |
| Rough Notes Company, Inc. | 525 |
| Rounder Records | 737 |
| Routledge | 990 |
| Rowman & Littlefield | 362 |
| Rowman & Littlefield Publishers, Inc. | 1507 |
| Royal Bank of Canada. | 1538 |
| Royal Philharmonic Orchestra | 254 |
| Royal Swirly | 100 |
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