Question: How many acts were in the music drama in which Heinz Zednik played David?
Sentence (from "Heinz Zednik"): He is also distinguished in roles such as Valzacchi ("Der Rosenkavalier"), Monostatos ("The Magic Flute"), Pedrillo ("Die Entführung aus dem Serail"), the Scribe ("Khovanshchina"), the Captain in "Wozzeck", and the Director (Luciano Berio's "Un re in ascolto").
Relevant evidence: No