Sources

Asked duck.ai “what are some sources for how music was used in war.” Fairly limited response, i.e., looks like only American sources. But these are excellent.

National Park Service — Civil War Music
Explains that music was used to relay orders, regulate camp routines, keep soldiers marching in step, raise morale, and express emotions like homesickness and patriotism.National Park Service

The Metropolitan Museum of Art — Military Music in American and European Traditions
Useful for the longer history of military music. It shows how drums, fifes, and bugles were used for signals in battle, summoning troops, and daily military communication, as well as ceremonial and morale functions.The Metropolitan Museum of Art

Kennedy Center — Music of the Civil War
Good for explaining how music helped with marching, camp life, morale, conflict, comfort, and camaraderie, and how soldiers also sang for emotional support.The John F. Kennedy Center for the Performing Arts

World War II Memorial/Friends — Music in World War II
Useful for WWII examples: radio songs, live performances, military bands, and V-Discs sent overseas to boost troop morale and connect soldiers with home.wwiimemorialfriends.org