Great songs you have there. Finding original WWI recordings of GERMAN or FRENCH songs, however, is pretty much non-existent.
It'd be cool if there was a record player that you could play essentially like a piano, but didn't have to sit at it for it to play a song.
After a bit of digging I found some French songs.
La Toussaint Rouge - 1917
Spoiler
[youtube]http://www.youtube.com/watch?v=nmqHKFRlDO8[/youtube]
La Marseillaise chantée - 1915
Spoiler
[youtube]http://www.youtube.com/watch?v=pks2kV6EjG0[/youtube]
Rigoletto en français - 1917
Spoiler
[youtube]http://www.youtube.com/watch?v=3c8BZGPlO8w[/youtube]
Le Chant du Départ - 1915
Spoiler
[youtube]http://www.youtube.com/watch?v=6BdwxIFOFj4[/youtube]
Minuit Chrétiens (Noël d'Adam) - 1910
Spoiler
[youtube]http://www.youtube.com/watch?v=tN2SN-riV-M[/youtube]