I am often fascinated by lengths and hoops people go through in researching songs, indeed very often grateful fot the provenance they provide. I really just concentrate on getting the right notes to the right words and get my arse slapped on more occasions than I can remmember for not knowing where the hell a song comes from. Ok, if one is earning money from someone elses work then it is important. So, what is more important, singing a song well and not knowing it's provenance or singing a song badly but knowing where every comma should be and who's version it is? Ok two extreme examples but in sessions where people are being exposed to the genre for the first time I am sure they would choose the former.