I would think it would be more of a distraction than anything. We are usually in such a hurry trying to get everyone ready by opening that having them watching TV would only make matters worse. There is at least once a year that we have an evening Ohio State footbabll game to contend with. Those are the worst nights for getting everyone ready.
To create a "mood" I usually put together a makeup room CD of themed music (Zombie, Alice Cooper, etc...) that we listen to while getting ready.