She was a singer in the recordings by Nikolaus Harnoncourt which began historically informed performances, such as Monteverdi's operas and works by Johann Sebastian Bach.
[1] She appeared as one of the Flower Maidens in Georg Solti's 1972 recording of Parsifal, with René Kollo in the title role.
She appeared in Monteverdi's operas, as La Musica and Euridice in L'Orfeo, alongside Lajos Kozma as Orfeo.
[3] A reviewer noted: "Rotraud Hansmann as Euridice sings beautifully with crisp diction and much attention to inflection.
"[4] She performed the parts of Amore and Minerva in Il ritorno d'Ulisse in patria, with Sven-Olof Eliasson [sv] in the title role, and as Virtù and Drusilla in L'incoronazione di Poppea, alongside Helen Donath as Poppea, Elisabeth Söderström as Nerone, Cathy Berberian as Ottavia and Paul Esswood as Ottone.