Depends on when you ask. Right now, it's:

Gone - Ferlin Husky
Johnny Be Fair - Buffy Sainte-Marie
Busted - Ray Charles
Pastures of Plenty - Woody Guthrie
Faded Coat of Blue - John McDermott
All The Best - John Prine
Don't Fence Me In - Sammy Kaye
Footprints in the Snow - Flatt & Scruggs
Song of the Prune - Frank Crumit
Angel Band - Old & in the Way