That's the Lykewake Dirge. Curiously that unsettling tune is Victorian, but it complements the traditional words perfectly. Thank you for your kind remarks. I think the definitive version is the Watersons.
I am sure that Pierre will wish to be le chapeau.
Or maybe le capot (which is not a capo).
Which reminds me of the joke about the Englishman whose wife died while they were on holiday in France. Distraught he went out to buy a black hat as a sign of mourning. Alas his French betrayed him. He entered the village store and the following ensued:
"J'aimerais acheter un capot noir s'il vous plait."
"Un capot noir, monsieur?"
"Oui, un capot noir, ma femme vient de mourir."
"Mais monsieur, quelle delicace!"
Er - WLD, yes, we are middle class!