Das tausendschöne Jungfräulein,She's in her 70's, her voice reduced to a guttural growl, but so what ? She "sings" the meaning, the spirit of the song. Suddenly we don't see a middle aged matron but the "persona" in the song. The young man is in love with a nice, pure girl whom he's seen outside her door, and then on her way to church. Obviously no hanky panky or overt flirtation - she might not even know who he is ! They may never even have spoken. It's very inward. But he's so much in love, the intensity shines through the formal simplicity. There's a set of DVDs by VAI of Lehmann's masterclasses for sale, so you can enjoy more of this.
Das tausendschöne Herzelein,
Wollte Gott, wollte Gott, ich wär' heute bei ihr!
And then she shows how to sing the Marschallin