New York City Center of Music and Drama, New York City Ballet, George Balanchine, artistic director, Jerome Robbins, associate artistic director, Leon Barzin, musical director, Lincoln Kirstein, general director, Lew Christensen, administrative director. II. "Interplay," first performed in concert varieties, Ziegfeld Theatre, June, 1945, music by Morton Gould (American Concertette), choreography by Jerome Robbins, scenery and costumes by Irene Sharaff, lighting by Jean Rosenthal, piano solo: Simon Sadoff, conductor: Leon Barzin.