Be British
La Brabançonne
Canada, I Hear You Calling
The Canadian Guns
Un Canadien errant
For the Glory of the Grand Old Flag
Freedom for All Forever
God Save the King
Good Luck to the Boys of the Allies
Hats Off to the Flag and the King
Hearts of Oak
Here's to Tommy
Highlanders! Fix Bayonets!
The Homes They Leave Behind

Source
Recordings of patriotic songs like "God Save the King" and "La Marseillaise" sold well during the Great War; Toronto Daily Star, March 9, 1915

Source
English advertisement for one of many patriotic songs about the flag, Montreal Daily Star, February 27, 1915
I Love You, Canada
Joan of Arc, They Are Calling You
Keep Your Head Down, Fritzie Boy
Land of Hope and Glory
Land of the Maple
Laurentian Echoes
The Made in Canada Campaign Song

Source
French advertisement for "Bonne chance aux soldats des Alliés" ("Good Luck to the Boys of the Allies"), La Presse, April 3, 1916, p. 4

Source
Victor Records advertisement for a patriotic song by Canadian Geoffrey O'Hara, Montreal Daily Star, 28-Jun-15
Maple Leaf Forever
La Marseillaise
Rule, Britannia
Soldiers of the King
Strike for the Grand Old Flag
Take Me Back to Dear Old Canada
Take Me Back to the Land of Promise
They Sang God Save the King
Three Cheers for the Army and Navy

Source
Advertisement for French national anthem "La Marseillaise", La Presse, July 25, 1916, p.2
Tommy Atkins
Valcartier
We'll Never Let the Old Flag Fall
We're from Canada