In certain clubs, you score points for the depth of research that went into the song. I was once married to a great Scottish singer who I heard say to a rapt and attentive folk club audience:-
"I learned this song from my mother... (respectful attention from audience, five points scored).... who learned it from her own mother (even better attention, ten credibility points on the board), who learned it..."
(audience leans forward expectantly)
"... from an Everley brothers album!"