John R. Cash--what's the earliest video available?

So we watched “Walk the Line”–I (musician) thought it was perty darned good. VeryCoolSpouse was less impressed. DadInLaw is a country musician and Mr. Cash was played around the house a LOT in childhood, so the music didn’t quite ring true for VCS.

I’d like to catch up, so to speak, by checking out the real Man In Black as far back in history as possible. What’s available?

The DVDs Good Rockin’ Tonight: The Legacy of Sun Records and Johnny Cash: The Anthology have TV footage from the 1950s and 1960s.