1. IUCAT. After you search, look for limiter options on the left side menu. You must choose two limiters: Online Resource, and Musical Score. By using those two limiters, you will see results for digitized scores. If you encounter barriers to access, send an email to: mistshaw @ indiana.edu
2. IMSLP. Only scores in the public domain are available at this website.
7.Gallica, digital archival collections at Bibliothèque nationale de France. The link provided will search music scores. If you start on the homepage of Gallica instead, scroll to the bottom of the page and try searching "Sheets" for scores. Ensure you select "En" on the upper right of the page to see results in English.