The Carolina Chocolate Drops, 2007 Alaska Folk Festival's Guest Artists, did a fascinating bit in one song. I'm not sure of its subject but it made the hair rise on my scalp when in the course of a song that Rhiannon Giddens was singing, Dom Flemons leaned over to her face and yodeled as a counterpoint to her voice. It was like wolves howling, it was like keening, although it was rich and smooth. If it isn't a mourning song it should be.