I've sorted out the US titles so far, many have music:

http://bluegrassmessengers.com/us-versions-the-elfin-knight.aspx

I'll post the rest of the music later.

Interesting to me is G.A. Griffin's version- you can listen to online- it's a country/hillbillty version collected in 1939 by Alan Lomax, then republished with music in 1950 by Morris under a different title. I've also put Morris' music. Strange!

http://bluegrassmessengers.com/the-cambric-shirt--mrsg-a-griffin-1939.aspx

I guess there are around 35 versions before 1950 so far. I haven't looked in many of my books and I have looked at all of Roud's list.

Richie