Actually that was The Sons of the Pioneers doing the playing in that film and you may find A Ha San Antone if you search The Sons Of The Pioneers. Ken Curtis the prominent vocalist in Rio Grande was on Gunsmoke as Festus Hagan and was the lead voice with TSOP for some time. He may even have replaced Tim Spencer, I am not sure. I also think he may have been playing guitar on that song and adding a voice too.

Don