What American composer who died in 1978 was associated with an American Opera Company located in Jackson, Mississippi?
Mississippi Opera: The Mississippi Opera is an American opera company located in Jackson, Mississippi. Mississippi Opera:  Composer William Grant Still and soprano Leontyne Price both have associations with the company. William Grant Still: William Grant Still (May 11, 1895 – December 3, 1978) was an American composer, who composed more than 150 works, including five symphonies and eight operas.
William Grant Still