To refine your library catalog search to only display scores, begin with a keyword search, then open the advanced search tab. Under Material Type, select Scores.

For further specificity, you may navigate to the dropdown filter, Limit To, and filter by format. The Online box will result in digital scores, and the Print/Physical Item box will yield catalog records for physical scores available to browse in the stacks.

• Fake Book Index
  Search over 75 "fake books" (collections of lead sheets, chord changes, lyrics, etc).
• Sheet Music Consortium
  Confluence of several library repositories focused on accessible online sheet music.