Composer Says He Hid Bits of “Wizard of Oz” in Score to Wicked Stephen Schwartz, composer of Wicked, the musical prequel to “The Wizard of Oz,” reveals that he hid bits of the classic Harold Arlen/E.Y. “Yip” Harburg score in his original score for the hit Broadway musical. The revelation comes in the trailer to an upcoming documentary on Arlen and Harburg, “The Sound of Oz,” being assembled by Harburg’s great-grandson, Aaron Harburg. Among others, the younger Harburg is interviewing celebrities who have been associated with “Oz” in various ways, to show how the film has influenced world culture. Here is a trailer for the upcoming film. In it, Schwartz says he hid “Oz” passages in five places in Wicked and plays one example, starting at the 1:40 mark.