Oxford Bibliographies Online: Music
Annotated bibliographies and research guides by music scholars. The "Find it in your library" links will help identify options for getting to the full text of cited sources.
Searches the full text of books scanned from publisher and library partners. Full text is mostly only available for older books (pre-1922), but table of contents are usually available for all books.
HathiTrust Digital Library
HathiTrust is a partnership of academic and research institutions, offering a collection of millions of titles digitized from libraries around the world. Remember to log in for the most complete access.