Use the following link to find books in the Library: https://library.nd.edu/
Make sure the search form is limited to 'ND Catalog'.
Besides the Hesburgh Library, other locations include 'Online' -- that one is easy -- and Rare Books (within the Hesburgh Building). Music, however, is elsewhere. The Music Library is in the O'Neill Building, south of the Stadium.
Use the tabs across the website:
Research: This tab takes you to databases and library guides.
Services: This tab takes you to Interlibrary Loan and Room Reservation.