Hmmm. I had a good time changing names into links in the above posts. I'm not sure I found the right Fallen Angels, and I had no luck finding a group called "Mna na Eireann" (Women of Ireland).
I didn't find much on the Grehan Sisters, either - just a dozen or so tracks on an Irish folk music compilation.
The Merry Wives of Windsor are very enjoyable.

-Joe-

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Later note: Sheila says she was talking about these Fallen Angels