- 29 July 2021 - 185,000 works have scores or parts on Petrucci Music Library.
- 21 July 2021 - IMSLP now has 69,000 recordings.
- 11 July 2021 - 590,000 scores.
- 9 July 2021 - 184,000 works have scores or parts on Petrucci Music Library.
- The holograph manuscript of Cimarosa’s L'italiana in Londra.
- The first edition of Walter Donaldson's Oh, Joe, with Your Fiddle and Your Bow, published by Broadway Music Corp.
- The first edition of Strauss’s Violin Concerto, Op.8, published by Aibl.
- The first edition of Coleridge-Taylor’s Southern Love Songs, Op.12, published by Augener.
- The first edition of Duchambge’s Ronde des pauvres, published by Pleyel.
- Kerll: Modulatio organica (#720383)
- Parker: That's Why I Stole a Kiss from You (#720378)
- Eberlein: That's Why! (#720377)
- Lilly: That's Where My Money Goes (#720376)
- Cormack: That's When I'll Marry You (#720375)
- Dusenberry: That's What They All Do (#720372)
- Edwards: That's What the Rose Said to Me (#720371)
- Bagley: That's What the Red, White, and Blue Means (#720370)
- Von Tilzer: That's What the Daisy Said (#720369)
- Bennett: That's What Makes a Wild Cat Wild (#720368)
- Zhang: Variations on Calabash Brothers (18 files)
- Rondeau: Trumpet Canon & Fugue No.86 (#720110)
- Rondeau: Trumpet Canon & Fugue No.85 (#720107)
- Rondeau: Trumpet Canon & Fugue No.84 (#720104)
- Rondeau: Trumpet Canon & Fugue No.83 (#720101)
- Rondeau: Trumpet Canon & Fugue No.82 (#720098)
- Greenleaf: The Labyrinth (2 files)
- Chic: Samsara (#720035)
- Caldini: Preludi elettrici, Op.110 (#720016)
- Caldini: Sulle scogliere di marmo, Op.132 (#720015)
