Have only just discovered this thread, for which many thanks, Monique.
I have been taking part in a Town twinning (Jumelage) between Linlithgow in Scotland and Guyancourt (near Versailles) for a number of years now, and our French friends introduced us to the music of Nadau just a couple of years back. This song, De Cap Ta L'Immortela, has almost become an anthem for US now, with it being sung all over Linlithgow at our last Festival! And I got the accordion part.
De Cap Ta L'Immortela