Edgar Yipsel Harburg was an American popular song lyricist and librettist who worked with many well-known composers. He wrote the lyrics to the standards "Brother, Can You Spare a Dime?", "April in Paris", and "It's Only a Paper Moon", as well as all of the songs for the film The Wizard of Oz, including "Over the Rainbow". He was known for the social commentary of his lyrics, as well as his leftist leanings. He championed racial and gender equality and union politics. He also was an ardent critic of religion.

The Wizard of Oz is a 1939 American musical fantasy film produced by Metro-Goldwyn-Mayer (MGM). An adaptation of L. Frank Baum's 1900 children's fantasy novel The Wonderful Wizard of Oz, it was primarily directed by Victor Fleming, who left production to take over the troubled Gone with the Wind. It stars Judy Garland, Frank Morgan, Ray Bolger, Bert Lahr, Jack Haley, Billie Burke and Margaret Hamilton. Noel Langley, Florence Ryerson and Edgar Allan Woolf received credit for the screenplay, while others made uncredited contributions. The music was composed by Harold Arlen and adapted by Herbert Stothart, with lyrics by Edgar "Yip" Harburg.