I’ve searched and found nothing as far as backing tracks. You might try to get in touch with Bill Anderson, who wrote it, or maybe Billy Ray who also recorded it. Another possibility,,, there are audio programs which remove the singer. The singer is usually set in the middle of the stereo recording. So that might be a possibility. Using Bill’s or Billy’s recording, and deleting the vocal, leaving you with the left and right music with no vocal.
That’s a good idea. Would the Sebelius program be able to do that?