Adrienne Young - Plow To The End Of The Row
Link is to her music page, but you can get to the rest of her site from there. NPR Story   She's pretty much a mix of bluegrass (or something near it)/oldtime/folk ~~ it's all there.

Karen Lynne - Blue Mountain Rain
Australian Country/Bluegrass artist. Samples Here


Sara Storer - Beautiful Circle
Another Australian Country Singer and former teacher in the outback, winner of seven Golden Guitars at the recent Australian Country Music Awards