program music definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
instrumental music that is meant to depict or suggest a mood or emotion, or a scene, story, or actual event
program music definition by American Heritage Dictionary
Musical compositions intended to depict or suggest nonmusical incidents, ideas, or images, such as those drawn from literature, as Tchaikovsky's Romeo and Juliet, or from works of art.