https://fr.m.wikisource.org/wiki/Fichier:Ensemble,_si_on_chantait,_tome_1_(extrait),_1986.djvuo5zw4CVF5bJW6
I couldn't find your version, but I think it comes from this songbook. It's the oldest version I could find.
"FR
Find the name of your songs
POSTER UN EXTRAIThttps://fr.m.wikisource.org/wiki/Fichier:Ensemble,_si_on_chantait,_tome_1_(extrait),_1986.djvuo5zw4CVF5bJW6
I couldn't find your version, but I think it comes from this songbook. It's the oldest version I could find.
"
Mamou2
Il y a 1368 jours
Brst
Il y a 1420 jours