She appeared in many operas by Richard Strauss, including the premiere of his Die Liebe der Danae at the Salzburg Festival in 1952.

[3] Felbermayer performed in Vienna in 1950 in Cherubini's Les deux journées with the Niederösterreichisches Tonkünstlerorchester, conducted by H. Täubler.

In Vienna, she performed as Nanette in a 1960 new production of Lortzing's Der Wildschütz, and as Sandmännchen and Taumännchen in Humperdinck's Hänsel und Gretel.

She appeared in many operas by Strauss, including as Echo in Ariadne auf Naxos, as Zdenka in Arabella, and in Intermezzo in 1963.

[2] Felbermayer created the role of Xanthe in the posthumous premiere of his Die Liebe der Danae conducted by Clemens Krauss at the 1952 Salzburg Festival.