Alison Krauss's pure soprano voice, fiery fiddling and leadership of bluegrass band Union Station make her a giant in American folk music. Krauss, who began as a child prodigy in the bluegrass world, never left her roots behind, but never hesitated to push the envelope either. In the ‘90s, she made newgrass history by transforming ‘60s soul music and in the ‘00s she cut a platinum-selling, genre-busting joint album with Robert Plant.