August 1939: American composer and bandleader Duke Ellington (1899 - 1974) plays guitar and Cab Calloway (1907 - 1994) plays piano during a jam session at a private party hosted by Hearst political cartoonist Burris Jenkins, in his studio, New York City. The guests include, left to right, Rosetta Tharpe, Duke Ellington, trumpeter Rex Stewart, Cab Calloway, unknown guest, and Duke's big band vocalist, Ivie Anderson (1905 - 1949). (Photo by Charles Peterson/Hulton Archive/Getty Images)