Maybe try the "Trio's" discs, with Emmylou Harris, Linda Ronstadt and Dolly Parton. Anytime you have discs where Linda Ronstadt has the roughest voice, you are doing well. I agree with the consensus the Margo Timmins has the moist, sorry I mistyped that, most unbelievable voice out there currently. I remember clear as day the first time I heard "Trinity Sessions", hanging out with some friends late on a Friday, trying to recover from their version of Sweet Jane, and then I get hit with her vocal on "Postcard Blues". Pity the harmonica pierces your eardrum after you are drawn in.
I just picked up the "Live at the World Cafe Disc" put out by WXPN the local "non-commercial" station in Philadelphia, and I really like Susan Tedeschi and the woman in the band Shivaree which is on the disc.
If Cornfedboy reads this, is the Classics Gold version of "Trinity Sessions" still in print?