Yes! I remember them well.
I wonder if somebody going score a deal with PBS to have these ladies appear
That is very doubtful. These are cloistered nuns (behind bars ;-). They don't have tv, radios or YouTube inside their cloister. They are separated from the world.
Aren’t Mother Angelica’s Nuns cloistered.
I have occasionally heard them singing behind the bars...
They are lovely to listen to, but it wasn’t Gregorian they were singing.