There's one that is traditional as far as I know and was recorded by Bascom Lamar Lunsford (LofC) and Cisco Houston (S/F). I've never heard Tony Rice do one. If it's the same I'll send you the full words; it starts:

John Booth came to Wasington, an actor great was he;
He played at Ford's Theatre and Lincoln came to see.
It was early in April not many weeks ago
That the people in that fair city all gathered for the show.

Any let me know. Dr John