BBC Radio 4 website says it is a re-edited version of an old show, but with extra footage not in the original!

Saturday 10 May 20:00

The Archive Hour
Across The Divide

Two gentle giants of folk music, both in their late 80s, British born Bob Copper and American protest singer, Pete Seeger come together and ruminate on the similarities and the differences in their lives.

Folk music and family are fundamental to them both, though their cultural backgrounds are very different. We hear them in conversation in a specially extended version of an earlier programme recorded in New York and in performance, and talk to their families about the tradition of folk music that both men have promoted and which their children and grandchildren are handing on to future generations.

Quack!
GtD