Thinking about other tunes book which could be made with a "theme", I wonder if a "world war one tunes" could be of interest ?
I listened to these songs and find them probably suited to a tune book :
"It's a long way to Tipperary" (1912, popular since 1914 with United Kingdom expeditionary forces coming to Boulogne-sur-Mer in France)
"Waltzing Matilda" (1895, Australia)
"Danny Boy" (on Londonderry Air, irish tune)
"Keep the home fires burning" (Ivor Novello, 1914)
"Pack up your troubles on your old kit-bag" (1915)
"Over there" (1917, when US declared war)
"Farewell to Slavianka" (1912 for Balkanic wars, but popular during WW1 among russian soldiers)
"Der Gute Kamerad" (Ich hatt' einen Kameraden, 1809 but very popular among german troops)
"Lili Marleen" (1938 but from the poem Lied eines jungen Wachtpostens from 1915)
"Quand Madelon" (1917)
"There's a long long trail" (1914)
"Roses of Picardy" (1916)
"I didn't raise my boy to be a soldier" (1915, anti war song)
"It's time for every boy to be a soldier" (1917, lyrics from the same author of previous song !!)
There are surely more of popular songs to add ! See here this tracklist.
Some other popular "tunes" of that time, such as from Debussy, Ravel or Holst are probably less suited to a tune book, I guess.
What do you think of it ? Gary Coover, after the Cowboy concertina, perhaps ?