|Ray Charles, The Four King Cousins |
(Tina and Cathy Cole, Candy Conkling,
Carolyn Cameron) and Jonathan Winters.
I found this interesting fragment in the Arte TV-documentary Abgedreht! - Jazz mit Ella Fitzgerald, Nina Simone & Ray Charles (2017):
It contains the closing notes of Baby, It's Cold Outside, performed by Ray Charles and Raelette Alex Brown. The other backing vocals are delivered by Merry Clayton, Gwen Berry, and Clydie King.
This probably means that this episode of the Jonathan Winters Show has survived. Who knows more?