Question: Rotraud Hansmann was a singer in the recordings by which Austrian conductor, particularly known for his historically informed performances of music from the Classical era and earlier?
Sentence (from "Nikolaus Harnoncourt"): Nikolaus Harnoncourt (Johann Nikolaus Graf [Count] de la Fontaine und d’Harnoncourt-Unverzagt; 6 December 1929 – 5 March 2016) was an Austrian conductor, particularly known for his historically informed performances of music from the Classical era and earlier.
Relevant evidence: Yes