One sentence in Last.FM's bio points out some of his major accomplishments ;-) : >> Known as “Mister Country”, Smith is the former husband of June Carter Cash and drinking buddy of Johnny Cash. Carl and June are the parents of singer Carlene Carter. <<
With June Carter, he recorded "Times A Wastin'" (full-length version at BLIP.fm).
With daughter Carlene, he later collaborated on the duet "Loose Talk" (full-length version at BLIP.fm).
Catching up with his songs, I found some great lines.
From 1967's "Life Turned Her That Way" (on the album "The Country Gentleman Sings His Favorites"):
"She's been walked on
And stepped on so many times
And I hate to admit it
But that last footprint's mine"
(by Harlan Howard)
"We live in two different worlds"