There are several good resources available for locating musical scores.
Image source: Public Domain. Wikimedia Commons.
Request materials not owned by LVC via Interlibrary Loan or ILLiad. ILLiad is a service that will either borrow or scan articles/materials you find.
Almost every LVC Library databases will provide a Request an item through ILLiad link on each result.
You can also request materials via ILLiad from the library's homepage.
With ILLiad, you'll either get a PDF of the journal or magazine article or a hard copy that will need to be returned.
Allow 2-3 days for an article; allow up to 2 weeks for books or media.