Fiddling soprano Alison Krauss started out in bluegrass and continually takes it in new directions. She doubled down on lush bluegrass harmonies in the George Jones-y "Ghost in This House" and adds a mournful mountain fiddle to "Please Read the Letter" with Robert Plant. Her Union Station bandmate Dan Tyminski returns to bluegrass' rollicking roots with "The Boy Who Wouldn't Hoe Corn".