God's Chillun, by Samuel Rosenberg, 1934.

Oil on canvas of a street scene depicting African-American male and female musicians playing music in the street. An audience of children, men, and women are gathered around them.
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Samuel Rosenberg, while a professor at the Carnegie Institute (now Carnegie Mellon University), founded the art department at the Irene Kaufmann Settlement, a private philanthropic social agency in the Hill District, and at the Isaac Seder Educational Center at the YM and WHA. He also served as chairman of the art department at the Pennsylvania College for Women (now Chatham College). His former students include Philip Pearlstein, Mel Bochner, and Andy Warhol. His work can be divided into four periods: 1915-1930, Portraits (and a few still life paintings); 1930-1942, Pittsburgh's Urban Landscape and the American Scene; 1942-1952, Allegory to Abstraction; and 1949-1972, Abstract Expressionism.