"The vocal harmony group tradition that developed in the United States post-World War II was the most popular form of rhythm and blues music among black teenagers, especially those living in the large urban centers of the eastern coast, in Chicago, and in Detroit.Among the ﬁrst groups to perform songs in the vocal harmony group tradition were The Orioles, The Five Keys, and The Spaniels; they specialized in romantic ballads that appealed to the sexual fantasies of teenagers in the late 1940s and early 1950s.