I think Eloise is going to turn out to be like Rosebud in "Citizen Kane" - we're never going to know. However Leadbelly did record a version of Linin'Track in NYC circa May 1944 titled Line 'Em (see discography in back of "The Life & Legend of Leadbelly" by Charles Wolfe and Kip Lornell) and was issued in the UK on vynyl on Folkways and then again on a cheapo label, XTRA. This was in the '60s. It is Lead, solo, and he does sing Eloise.As to Karl Dallas he was an important member of the Folk scene in England and Scotland, he was a journalist proselytizer and performer, amongst other things, he published two collections of traditional songs under the titles of "The Cruel Wars" and "Songs of Toil" Sadly however I believe he has been dead for many years now.