"Pilgrims have walked through France and Northern Spain to Santiago since 700 AD."

I'd like to do this hike myself one year: Camino de Santiago

Pilgrim songs can be highly evocative, bringing to mind the caravan of travellers who would use such celebratory songs to keep up both spirits and the pace of a long dusty journey. As SO'P mentions upthread, much humour to be found in the miraculous interventions they can depict. In A Madre do que a Bestia we have an elderly lady who entrusts the care of her lone sheep to a cunning shepherd who lies to her, telling her it was eaten by a wolf. The devout lady implores the Virgin to intervene on her behalf, which she does, making the sheep speak cry out saying "Here I Am!!". The version I have, sung by Belinda Sykes, is much funnier than the link - as she earnestly tells and sings it story fashion. The little sheeps cry comes out "Heeeeeaaaarrrr Ayyyeee Ahhhhhhmmmm".