Look at Birgits face after the Zarah song. She later told us in a radioshow that she had a lump in her throat, the song captured the audience and the whole atmosphere was electric.
Utterly delightful to hear Nilsson sing this in the context of her great voice and years of singing Wagner and other dramatic operatic roles. She is so charming and unvarnished for one of the greatest opera singers ever to have lived. Zarah knows how to deliver a song like few others, she moved and captivated me even though I had no idea what she was singing!