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"): Many of the 20th century's most famous operetta composers, including Franz Lehár, Fritz Kreisler, Robert Stolz, Oscar Straus and Paul Abraham, composed works especially for her.
Relevant evidence: No