Hah! I found them. Tam Lyn is the name of the band, from So Cal. The title they use at their website is the Hush, Hush title.

Here is their website:

http://www.celticband.com/

I have a feeling there may be quite a few recordings of your song going by the name Hush, Hush, and claiming it as traditional. I've heard more than one musician friend claim that it was (though I've corrected them!)