The online resource compiled by the Library of Congress National Digital Library Program. With the participation of other libraries and archives, the program provides a gateway to rich primary source materials relating to the history and culture of the United States.
A list of digitized sheet music compiled by the staff at Duke University Libraries.
Digital Mozart Edition: A Project of the Internationale Stiftung Mozarteum and The Packard Humanities Institute. Includes both the music and critical commentary volumes of the Neue Mozart-Ausgabe.
A unified index to a broad group of digitized sheet music collections, including contributions by Duke University, Johns Hopkins, Indiana University, and UCLA. Useful to researchers interested in sheet music and to social historians.