Whoa, mule, whoa. Don't you hear 'em holler?
Tie a bow-knot in his tail or he'll jump through the collar.

Why don't you take him to the track? Why don't you let him go?
Every time I turn around, it's "Whoa, there, mule, whoa."

Riding on a hump-back mule, oh mule,
Riding on a hump-back mule,

This is what I recall of the lyrics from an old 78.

HTML line breaks added. --JoeClone, 7-Jun-02.