From the Performing Arts Reading Room of the Library of Congress, this site includes a variety of links for music, musicology, musical theater, music therapy, opera, sacred music, and film music. It also contains links to professional organizations in music and allied fields.
A comprehensive list of Internet links from the American Musicological Society. Although primarily aimed at musicologists, this site provides a wide variety of links related to the study and performance of various musical genres.
The MOBIUS system is a "union catalog" that includes the collections of over 70 libraries in Missouri. There are over 4 million unique items on the system; users can order books online for delivery to their home libraries.