The Kirk Collection Kirk Collection at the Indiana State University Library has the sheet music of the vocal version (but not online). Here's the catalog entry:

Title: South.
First Line: Down below that old Dixon Line, there's a place that really is fine
Chorus: Where the folks are happy and gay, and the easy way is the right way
Music by: Moten, Bennie, and T[hamon] Hayes.
Words by: Charles, Ray.
P/P/D: New York : Peer International Corporation, c1941.
Location: SPC, KIRK PS 1940-1941

Here's what I transcribed from a sound sample at Yahoo! Shopping > Music:

Down below that old Dixon Line,
There's a place that really is fine.
Don't you know what I'm talkin' about?
You want to find out,
Then take a tip from me:
Down below that old Dixon line,
Where the sun is happy to shine,
Where a friendly face is common to see,
That's where I'm longin' to be.
Where the folks are happy and gay,
And the easy way is the right way,
Where the bees make honey all day,...

Spade Cooley also recorded this song in a western swing style, but the only sound sample I could find didn't contain any lyrics.