A war song is a musical composition that relates to war, or a society's attitudes towards war. They may be pro-war, anti-war, or simply a description of everyday life during war times.
The All Blacks perform "Ka Mate"
It's a Long Way to Tipperary
"It's a Long Way to Tipperary" is an English music hall song first performed in 1912 by Jack Judge, and written by Judge and Harry Williams, though authorship of the song has long been disputed.
Sheet music cover
Sculpture in Tipperary Town, Ireland, commemorating the song
The song was so popular that its title is referenced in English in this German propaganda poster for distribution in occupied France.