| A |
| Name | Number of records |
| Aaron Ashley, Inc. | 1452 |
| Addax Music Company, Inc. | 225 |
| Addison Wesley Longman, Inc. | 824 |
| Addison-Wesley Publishing Company, Inc. | 5592 |
| Adelaide Productions, Inc. | 2990 |
| Adobe Systems, Inc. | 5374 |
| Adra Music | 220 |
| A&E Television Networks | 248 |
| Air Bear Music | 135 |
| AJS Publishing & Copyright Services | 153 |
| A&M Records, Inc. | 2222 |
| Anderson Publishing Company | 737 |
| Andleer, Inc. | 635 |
| Andrews McMeel Universal. Universal Press Syndicate | 311 |
| Angel | 120 |
| Annie's Attic | 440 |
| Annie's Attic, Inc. | 414 |
| Annie's Attic, LLC | 1238 |
| Annotation Music | 267 |
| Anthony K. Music | 371 |
| Anwa Music | 175 |
| Apollo Group, Inc. Apollo Press, Inc. | 255 |
| Appleton & Lange | 380 |
| Appleton & Lange, Inc. | 576 |
| April Music | 98 |
| April Music, Inc. | 2970 |
| April Music, Ltd. | 123 |
| A-R Editions, Inc. | 398 |
| Atlantic Forlags, A.B. | 210 |
| Atlantic Monthly Company | 238 |
| Atlantic Music Corporation | 802 |
| Atlantic Music Corporation. | 901 |
| Atlantic Recording Corporation | 3179 |
| Atlantic Records | 187 |
| Atlantis Films, Ltd. | 288 |
| ATV Music, Ltd. | 265 |
| ATV Music Publishing of Canada, Ltd. | 150 |
| Avant Garde Music Publishing | 195 |
| Ave Maria Press | 293 |
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