FLORENCE, AZ - APRIL 07: Singer/Songwriter Toby Keith performs during ... the rest of those 10,000-plus units. Greatest Hits: The Show Dog Years marks Keith’s milestone twenty-fifth placement ...

In 2004, Krystal and Toby Keith recorded a cover of "Mockingbird" together, which was released as part of the latter's album "Greatest Hits 2." Keith's son Stelen Keith Covel also paid tribute on ...