I have actually spent time in French record stores trying to get an answer to this, and haven't gotten anywhere--I can't even hum it, because you can only hum one of the melodies at a time, and one their own, you can't tell what the song is--

Maybe next time I go to France, I'll have to take a CD of the canon, and go to a record store--but there has to be an easier way to find this out!