McKoy, Millie-and-Christine. Carte-de-visite Photograph of Millie-and-Christine McKoy (1851 – 1912), the “Two-Headed Nightingale” by W. L. Germon’s Temple of Art, 914 Arch Street, Philadelphia, no date, circa 1875. Mount: 10.5 cm x 6.3 cm; image 9 cm x 5.5 cm. An albumen print in fine condition. Corners rounded for album insertion. Pencil identification on the verso. Born into slavery and at the mercy of their exploitative promoter-owners, the Emancipation Proclamation ended the McKoy twins’ slavery in 1863. Having been kidnapped and taken to England, the twins received their education and musical training there and began to enjoy success as instrumentalists and singers, thus turning their impediment into an asset, before returning to the United States and appearing in Barnum’s circus.