Regionalism (noun)
A school of American artists who focused upon specific regions of the United States in an effort to celebrate ordinary Americans and their regional culture.
In his painting The Ballad of the Jealous Lover of Lone Green Valley, Thomas Hart Benton, the leader of the Regionalist art movement, illustrated a popular folk song and set it in the Ozarks. The models are his friends and family. The man playing the harmonica in the foreground is his promising young student, Jackson Pollock.