This song has been around for 80 or so years, performed by everyone from Lawrence Welk, Bing Crosby and Gene Autry to Johnny Cash, Brian Wilson and Low. This version took my breath away. Producer Dave Cobb (known for his work with WGOM favorites Sturgill Simpson & Jason Isbell as well as Shooter Jennings and Stapleton) put together a compilation album this year called Southern Family which is where this tune can be found.
I heard an even cleaner performance of this on Fallon last month, but I could not find it online.