Look, we don't know why these bluegrass bands are playing Soul'd Out. Probably to make it even more hippie friendly. Unlike some of the traditional—and outstanding—roots-music acts we have here in the Northwest, Michigan's Greensky Bluegrass and Minnesota's Pert Near Sandstone err on the side of progressivism, making for that weirdly smooth version of new-grass that pleases public radio listeners. NED LANNAMANN