Sarah's comment that Grace Bumbry did an homage a Lotte is interesting. I assume this means she acted it all out ala Lotte. It would be fun to see this.
Homage a Lotte Lehmann
How interesting. I keyed in "Homage a Lotte Lehmann" and up it came. It's a DVD, naturally.
Long before Lotte Lehmann there was a school of acting that associated each emotion with a specific movement. This would have been very popular with opera singers who generally like to concentrate on their high notes.