I hope Guy Clark improves.
Here is another artist that slowed down due to Lyme disease; he does a fine Gene Vincent tribute show, as others have done Elvis or Johnny Cash or Buddy Holly and even Connie Francis. I think Ervin Travis is French actually.
Ervin Travis and the New Virginians (Gene Vincent was from Virginia, GV served in the Navy); they are nuts about Gene Vincent in France and the United Kingdom, Germany, Italy, Netherlands, etc. along with Rockabilly in general.
http://www.youtube.com/watch?v=TT0XYAKQWCkhttps://www.facebook.com/ervin.travisI met one person with Lyme disease and he recovered fully, others seem to have problems with it.