This is one of my favorites of The Tune Wranglers (and thus of Western Swing of which the band was a main exponent): banjo and fiddle meet Duke Ellington, and they definitely have the swing:
The flipside by Doug Bine And His Dixie Ramblers is very good as well, a rousing Western Swing treatment of a Famous Hokum Boys tune (and previously recorded by Milton Brown And His Brownies in the Western Swing way):