There are so many photos of Lehmann in Der Rosenkavalier, that I devoted a whole page to that opera (in which Lehmann performed all three lead soprano roles). But Lehmann always stressed that, though she was best known in the US as the Marschallin, she had always immensely enjoyed singing Leonore in Fidelio, Sieglinde in Die Walküre, and Elisabeth in Tannhäuser.