Question: Marta Eggerth was a singer from the silver age of which genre of light opera, "light" in terms both of music and subject matter?
Sentence (from "The Divine Spark"): The Divine Spark is a 1935 British musical film directed by Carmine Gallone and starring Marta Eggerth, Phillips Holmes, Benita Hume and Donald Calthrop.
Relevant evidence: No