I'm surprised I haven't noticed the Stairwell Sisters until this thread. They're from Oakland, California, about a hundred miles from me. Here in California, they seem to perform in small and medium-sized venues.

I found a generous selection of videos here (click), and their Web page is http://www.stairwellsisters.com.

I suppose now that I've heard of them once, I'll hear of them all the time and find out that I have a dozen friends who know them well.

-Joe-