Music

"The Performing Arts Encyclopedia serves as a guide to the collections and resources at the Library of Congress that pertain to music, theater, and dance. Most of these collections and resources can be found in the Music Division, the Motion Picture, Broadcasting and Recorded Sound Division, and the American Folklife Center, although there are additional resources available in other divisions of the Library such as the Manuscript Division and the Rare Books Division."

"CANTUS is a database intended to assist scholars in their study of the chants of the Office. It is made up of indices of the chants in sources of the liturgical Office. It uses as models two older kinds of indices--those published in various facsimile editions of sources, and those presented by Dom René-Jean Hesbert in Corpus Antiphonalium Officii [hence CAO]." Full details about the database are available on the About CANTUS page.

The Aria Database is a diverse collection of information on over 1000 operatic arias. Designed for singers and non-singers alike, the Database includes translations and aria texts of most arias as well as a collection of MIDI files of operatic arias and ensembles.

Duke University itself has also collected American sheet music. "The Rare Book, Manuscript, and Special Collections Library at Duke University holds a significant collection of 19th and early 20th century American sheet music. The Historic American Sheet Music Project provides access to digital images of 3042 pieces from the collection, published in the United States between 1850 and 1920."
Free Internet resource.

"The Sheet Music Consortium is a group of libraries working toward the goal of building an open collection of digitized sheet music using the Open Archives Initiative:Protocol for Metadata Harvesting (OAI:PMH)."
Site is a free internet resource. Collections or sheet music records within it may not be.

The Werner Icking Music Archive (WIMA) houses sheet music and MIDI sound files for music by hundreds of composers. Researchers and scholars from across the globe contribute to the archive, and the site is available in several languages, including English. Search for titles or composers in the search bar, or browse the list of composers.
Free Internet resource.