The only song guaranteed to make me weep: http://www.youtube.com/watch?v=ylOCIP54PIQ

As for folk, I remember a floor singer singing The Plains of Waterloo at the Bay Hotel Folk Club in Cullercoats in the early 1980s; don't know who he was, but I was gutted! Some songs I can't through for blubbing - Danny Deever and Banks of Sicily come to mind.