The question of 'what is folk?' is always a bone of contention here. I can't really be arsed to argue it either way. I do however understand that people who prefer the song as close to the original as it can be done are worried, and rightfully so. Music is important. So is tradition. And as more and more music is either ignored or changed, that tradition gets lost. We have seen that clearly when searching the i'net for songs that were popular but one hundred years ago. Some are gone forever--fewer than one might think as long as Jim Dixon is looking, but too many for all that. I wish I had an answer.