"Her career peaked in the early and mid-1950s, which included her Brünnhilde in Wilhelm Furtwängler's famous 1954 studio recording of "Die Walküre" and his 1953 live recording of "Der Ring des Nibelungen" (his only uncut recording of the cycle), along with the title role from "Fidelio" with the same conductor also in 1953 (at first live and then in studio), and Isolde in Herbert von Karajan's 1952 "Tristan und Isolde", live from Bayreuth.