A couple of Melusine links from several thousand (!):

Melusine
Melusine - The Mermaid

I've seen it suggested (without cited evidence, so it may well be imaginary on someone's part) that she was the progenitor of the Plantagenet dynasty; that might, I suppose, explain why David Icke (sp) believes that the British royal family are actually carnivorous shape-shifting lizards; mind you, that would probably make most of us at least partly Dragon, which is rather a nice thought.

Nancy Kerr doesn't seem to have recorded the song, whatever it's called.  She's a friend of a friend, though, so I'll ask.

Malcolm