Question: Which opera did this American composer and pianist whose Broadway show songs were included in The Passing Show of 1916 compose?
Sentence (from "George Gershwin"): Among his best-known works are the orchestral compositions "Rhapsody in Blue" (1924) and "An American in Paris" (1928) as well as the opera "Porgy and Bess" (1935).
Relevant evidence: Yes