- You may be looking for the Class episode or the Jim Moray song.
"Night Visiting" was a 20th century folk song. April MacLean played it on her violin. (TV: Nightvisiting)
History
The song was inspired by folk stories of spirits of deceased loved ones that would knock on their living relatives windows at night and appear to them, sometimes as a warning of danger and other times to drag their living relative to Hell with them.