Bumbry, Grace. (b. 1937) Signed Photograph, Studying "Un Ballo in Maschera"Signed doubleweight photograph of the American mezzo soprano, one of the pioneering generation of African American opera and classical singers in the mid twentieth century. She is shown curled up in an armchair, studying the score to Verdi's Un Ballo in Maschera, and has signed boldly at the foot. In very fine condition. 8 x 10 inches (20 x 24. 8 cm).