Question: What American composer who died in 1978 was associated with an American Opera Company located in Jackson, Mississippi?
Sentence (from "San Antonio Opera"): The company was founded as the Pocket Opera of San Antonio in 1997 by Mark Richter, and opened its first season in the fall of 1997 with Wolfgang Amadeus Mozart's "Der Schauspieldirektor" at the San Pedro Playhouse.
Relevant evidence: No