The BACKGROUNDS TAB Lets you control the backgrounds for the current song or for the set of songs. You can select a "default" image for the whole show. In order to display the "default" background you "Prevent Different Backgrounds" by clicking the appropriate button.

You can also seelct a "defaut" movie loop for the entire show. Simply select an appropriate movie loop and the click "Prevent Different Media" button


Form here you can also select different movie loops for each song with "Add Media Backgrounds" or press ALT-F3 and add them to the list of songs.