The Music and Performing Arts Library has a large collection of historic American sheet music, including some digitized Civil War materials and digitized World War I materials. While we do not have all of it digitized, you can search all of our historic sheet music holdings from the collections’ web page.

The Library of Congress has a Civil War Sheet Music Collection and a World War I Sheet Music Collection.

A helpful text on conducting research about music and war is this title:

Music and war : a research and information guide by Ben Arnold, 1993.
Music & Performing Arts Reference [non-circulating]
Call Number: ML128.W2 A76

We have many materials relating to Civil War songs in our collections.

For more information about World War I songs, see also:

World War I sheet music : 9,670 patriotic songs published in the United States, 1914-1920, with more than 600 covers illustrated
by Parker, Bernard S., 2007.
Music & Performing Arts Reference [non-circulating]
Call Number: ML128.W2 P37

World War I songs : a history and dictionary of popular American patriotic tunes, with over 300 complete lyrics by Frederick G. Vogel,1995.
Music & Performing Arts Reference [non-circulating]
Call Number: ML3561.W3 V63

We have many other books, music scores, and recordings in our collections related to music and war. Check them out!