The Submission Project attempts to expand the repertoire available on IMSLP by submitting scans from other high-quality public domain archives. Current sources:

• CH-Bu (Universitätsbibliothek Basel)
• CH-Bm (Musik-Akademie Basel)
• CH-BEsu (Universitätsbibliothek Bern)
• CH-Gpu (Bibliothèque de Genève)
• CH-Zz (Zentralbibliothek Zürich)
• CZ-Pu (Národní knihovna České republiky)
• D-Tu (Universität Tübingen)
• F-LYc (Médiathèque Nadia Boulanger)
• N-Bo (Bergen Offentlige Bibliotek)
• N-Onm (Nasjonalbiblioteket)
• PL-Kj (Uniwersytet Jagielloński)
• SDL (Śląska Biblioteka Cyfrowa)
• US-COu (Ohio State University)
• US-DMu (Duke University)
• US-EU (University of Oregon)
• US-MAu (University of Wisconsin-Madison)
• US-SVu (Mississippi State University)
• US-NYpm (The Morgan Library & Museum)
• US-WC (Baylor University)