"The 20th Century Fox Mambo" is an original song introduced in the second episode of the first season of the musical TV series Smash, entitled "The Callback". It was written by Marc Shaiman and Scott Wittman, but in the show's universe, it was written by songwriting team Tom Levitt (Christian Borle) and Julia Houston (Debra Messing) for their Marilyn Monroe musical Bombshell. The song, with McPhee's vocals, was originally released as a single on iTunes and Amazon.com's MP3 store and is currently available on the cast albums The Music of Smash and Bombshell.