The Army of Today's Alright
The Company Sergeant Major
Fun in Flanders, Part 1
Fun in Flanders, Part 2
Life in a Trench in Belgium, No. 1
Life in a Trench in Belgium, No. 2

Source
The YMCA offered some comfort for soldiers at the front

Source
Canadian soldiers created music on "found" (hand-made) instruments even in bombed-out settings such as this, July 1917
Life in a Trench in Belgium, Part 3, Fun in Flanders
Life in a Trench in Belgium, Part 4
Oh, How I Hate to Get Up in the Morning
Oh! Oh! Oh! It's a Lovely War
Parodies of the Camp
A Soldier's Day
Submarine Attack Somewhere at Sea
When the Lusitania Went Down