google The Pair Extraordinaire Carl Craig Marcus Hemphill
a.k.a. "The Pair" is described as a Texas duo.

http://itismagic.blogspot.com/2005/08/pair-extraordinaire.html

http://www.youtube.com/watch?v=q11w-CgVQTo

I'm an Old Cowhand from the Rio Grande is a comic song
written by Johnny Mercer (lyrics and music) and Harry
Warren (music) for the movie Rhythm on the Range (1936),
sung by Bing Crosby.