Was that just a cool breeze, or is the ghost of Hank Williams breathing down your neck? Who, or what, lives beneath the fog and mud out by Wooley Swamp? And why is Alison Krauss's apparition floating around that dark mansion? Country music's best ghost songs ask these questions, but provide no answers. Listen to all five that made our list and then decide for yourself if the legend is true, or just the creation of some clever songwriter's imagination.