Flagstad and Melchior - Tristan and Isolde "Love Duet", 1/2
"O sink hernieder" - The Love Duet from Act II of Tristan and Isolde - part 1 of 2
One interesting note on this recording - not only is Flagstad Isolde, but from 5:18 to 7:40 she is also singing the offstage part of Brangaene (this is a studio recording rather than a live performance). So this document is unique. It is the only recording of Flagstad as Brangaene.
To hear this duet's conclusion, click the response video.