thank you so much everyone for your responses :-)

I am really sorry my reply is so delayed i went away for a while and found there was no internet there! :-(

From the research i am gathering i am making a musical family tree to find out how the song has been passed along, a timeline, and a radio program discussing my findings. As this is academic work i will not be able to make it public until June and will only be allowed to show the family tree and timeline.

The wide variety of responses is very interesting!

I will post back here in the next few days to continue the discussion :-)

thanks
Emily