Seymour Swine done by a popular country music singer?

This is a bit out of season, but I was just listening to this song and remembered something:

When I was discussing the song “Blue Christmas” by Seymour Swine with some friends, the assistant principal (I was in school) happened by and said “Say, did you happen to know who did that song?” I replied, “Seymour Swine did it.” “No,” he said, “That song was done by a famous country singer who kept himself anonymous, and used ‘Seymour Swine’ as a stagename. I was wondering if you knew.” I said that I didn’t, and he thanked me and left.

So, I was wondering if anyone happened to know if this tidbit is true?

Apparently it was originally done of the John Boy and Billy Big Show radio program. According to thebigshow.com:

Not exactly famous, and this coming from a guy who’s lived in Nashville for 32 years.