Porgy and Bess
Description of Gershwin's Porgy and Bess from the Metropolitan Opera's website:
A supremely American operatic masterpiece and the most ambitious work by one of the nation’s greatest musical talents, Porgy and Bess focuses on the joys and struggles of a black neighborhood in Charleston, South Carolina, in the early 20th century. The overall combination of music, word, and idea among a complex blend of Americana make this a unique and impressive work both within and beyond the operatic repertory.