Search the Library Catalog... then use "Tweak my results" to limit to Scores only:
Search words in other languages (e.g., French, German, Italian).
Search the work number AND composer's last name | ex: brahms AND "op. 5"
to search words as a phrase
for example: "john cage"
as a wild card
for example: wom*n
AND between words to NARROW results
for example: cat AND dog
OR between words to EXPAND results
for example: cat OR kitten