Question: What was the name of the period instrument ensemble that was formed in the 1950s by the conductor with whom Elisabeth Kulman recorded Beethoven's "Missa solemnis"?
Sentence (from "Elisabeth Kulman"): Elisabeth Kulman (born 28 June 1973) is an Austrian classical singer who has performed operatic roles in soprano, mezzo-soprano and contralto repertory.
Relevant evidence: No