Marion Lippert is a soprano I will always remember with affection, as she was my first (and a very lovely) Marschallin in a performance at The Met in 1970, conducted by Karl Böhm; she more than held her own in a stellar cast featuring Christa Ludwig, Reri Grist, and Walter Berry.
Marion Lippert was born in Munich in 1936. Among her voice teachers was Annelies Kupper. Ms. Lippert made her operatic debut as Aida The Hague in 1956, later joining the opera companies of Cologne and Stuttgart, and singing in Berlin, Paris, Barcelona, and Venice. Her repertory included Lady Macbeth, Abigaille, Leonore in FIDELIO, Amelia in BALLO IN MASCHERA, Leonora in FORZA DEL DESTINO, Tosca, Norma, Senta, Elisabeth in TANNHAUSER, and Sieglinde.
The soprano made her Met debut in 1968 as Turandot; she also sang Senta, and Elisabetta in DON CARLO (which I saw) at the House in addition to the Marschallin.
Turandot became a signature role for Ms. Lippert; here is her "In questa reggia" from an unnamed venue, in 1969. Her Calaf is Flaviano Labò.
Marion Lippert - In questa reggia ~ TURANDOT - 1969
Marion Lippert's 'Vissi d'arte' (though missing the opening line) may be found here.