 A brief prologue of "Mrs. Horace Vandergelder" was added to the song to integrate it into this film.Working under the musical direction of Lionel Newman and Lennie Hayton, the very large team of orchestrators included film stalwarts Herbert W. Spencer and Alexander Courage; the original Broadway production arranger, Philip J. Lang, making a rare film outing; and established television and pop arrangers Joe Lipman, Don Costa, and Frank Comstock.All of the actors did their own singing, except for Marianne McAndrew (Irene Molloy) whose singing was dubbed by Melissa Stafford for Irene's vocal solos and Gilda Maiken for when Irene sings with other characters.