I have been trying to find the origins of this song also. I have had for many years an old tape, rather scratchy that sounds like it was recorded in the 40's or early 50's of Plastic Jesus. Several years ago, I digitized it for a mix CD of humorous songs. It begins with an organ and a voice saying "Good morning, friends; this is the hour of reckoning...(then singing) Hello, friends and neighbors; how do you do?"
It sounds like a real ad or spoof ad from Del Rio, Tx with a live audience.
I will be happy to send an mp3 of it to whoever thinks it might help them identify the performers. I can be reached at jdcrump at Yahoo dot com if you are interested.