program music

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun music A form of art music that attempts to convey a scene, image, or mood.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun musical compositions intended to evoke images or remind the listener of events