I truly love, love, love this harmonic performance. I even remember seeing it when it first aired aired on the Bing Crosby Holiday TV Special, long before anyone had a Betamax or VHS machine in their homes to record performances such as these. I was so thankful that it turned up on You Tube all these years later for me to watch over and over again. I even watch it through out the year.
There is really nothing much for me to say as the vintage performance speaks for itself.
Relax and enjoy the music of two great singers.