To the contestants on “American Idol,” if you’ve made it to this week’s Final Four, you’re either on the verge of winning it all, or of being a pretender and fading into the show’s collective oblivion soon. Mentor Jamie Foxx signified as much when he had t-shirts made up that said “contestant” and “artist,” and told each one of them that they had to earn their artist shirt this week to prove they are ready. Corny, yes, but effective and correct. The theme this week was songs from movies, which is about as vast a catalog as there is.
