Which of George Gershwin's works is considered one of the first to blend jazz with classical music to create folk opera?

The choice that accurately reflects one of the first works to blend jazz with classical music to create folk opera is "Porgy and Bess." This operatic work, composed by George Gershwin and first performed in 1935, is set in the African American community of Catfish Row in Charleston, South Carolina. It incorporates elements typical of jazz alongside classical structures and showcases a narrative style reminiscent of folk opera, using a mix of popular song, jazz rhythms, and classical harmonies to convey its story.

Porgy and Bess is particularly significant for its innovative fusion of musical styles and its cultural commentary, making it a landmark in American music. While works like "Rhapsody in Blue" and "Concerto in F" incorporate jazz influences, they do not achieve the same depth of thematic storytelling typical of folk opera. "Blue Monday" is an earlier jazz-influenced work, but it does not share the same widespread recognition and significance as Porgy and Bess in the context of American operatic tradition.