And they do it well. Not quite world stage, Galeet Dardashti, well, but definitely 'drive for an hour see them' well. Valerie Davine's got a lovely, passionate, voice, and the rest of the combo (Linda Wertz on bass, Debbie Singer on guitar, Julie Anolik-Cassell on percussion and cello, Karen Charney on flute and vocals, and Rita Offut on vocals) are tight and talented. I don't think they have any recordings out, but if you live in Iowa you should check their upcoming performances list.
Here's a video from a 2005 performance, for more videos see their video page.