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 "Marta Eggerth"): Marta Eggerth (17 April 1912 – 26 December 2013) was a Hungarian-born American actress and singer from "The Silver Age of Operetta".
Relevant evidence: Yes