Cumberland Gap

The Main Line Gravy Soppers.

Key of D, usually. There are lots of versions of this tune: 2 or 3 parts, 2 or 4 repeats of the first part, sung or instrumental. The Phillips Collection lists 5 versions.

Not to be confused with... 

The Cumberland Mountain Deer Race sung by Uncle Dave Macon [utoob non-video] also known as the Cumberland Mountain Bear Chase sung by Pete Seeger [utoob non-video].