Someone just posted a link to a fansite for Ken Curtis - Festus Hagan on Gunsmoke, and a former lead singer for the Sons of the Pioneers. Apparently all the people trying to look at it are a mounting to a DDoS attack on the site, so I'm letting it load in another window; but I did get enough to note that one of his albums includes the title Silver Bells. If it finishes loading, I may be able to find out more, but it doesn't appear to be one they have sound tracks for.