From the AFI website:
"The Criteria
The jurors were asked to consider the following criteria while making their selections:
Feature-Length Fiction Film: The film must be in narrative format, typically more than 60 minutes in length.
American Film: The film must be in the English language with significant creative and/or financial production elements from the United States.
Song: Music and lyrics featured in an American film that set a tone or mood, define character, advance plot and/or express the film's themes in a manner that elevates the moving image art form. Songs may have been written and/or recorded specifically for the film or previously written and/or recorded and selected by the filmmaker to achieve the above goals.
Cultural Impact: Songs that have captured the nation's heart, echoed beyond the walls of a movie theater, and ultimately stand in our collective memory of the film itself.
Legacy: Songs that resonate across the century, enriching America's film heritage and captivating artists and audiences today."
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