A black and white photograph depicting Kirsten Flagstad in the role of Isolde from the Richard Wagners opera Tristan und Isolde. The photo is framed together with Flagstads autograph. Kirsten Malfrid Flagstad, 1895 to 1962, was a Norwegian opera soprano singer who ranks among the greatest singers of the 20th century. In the years before World War II, Kirsten Flagstad and Lauritz Melchior were considered to be the prime interpreters of the lead roles in Tristan und Isolde. Green mat, golden frame. Theater Opera Music Collectibles And Memorabilia, Authographs.