I hope she is referring to the performance of the German Requiem with Kathleen Battle as the soprano soloist and Robert Shaw conducting the San Francisco Symphony and chorus. I sang in the chorus and it was one of the more wonderful musical events of my lifetime. This is as close as we can come.
This is another film than the one I posted before, but somewhere in there is Kathleen Battle.
but I will see you again,
and your heart shall rejoice,
and your joy no man taketh from you.
(Choir: Thee will I comfort
as one whom a mother comforts.)
Look on me: for a short time
I have had sorrow and labour
and have found great comfort.