One of my picks is Emily Smith's full CD or two songs from it, May Colven and The Mermaid Of Galloway, since they go with our most recent hot topics on the blog. May Colven is a ballad of the Child variety, connected with Bluebeard. The Mermaid of Galloway is a ballad by Allan Cunningham that Emily Smith has modernized a bit. Both are excellent.
Or there is Captain Jack and the Mermaid by Meg Davis.