Tonight the Top 12 finalists perform live for the nation, vying for the American Idol crown. In this special two-hour show, the contestants will sing their hearts out in hopes of winning America's vote and surviving another week in the competition. T... (more)une in to see who impresses the judges and who buckles under the pressure. Tonight's theme: Lennon / McCartney songs. Performing tonight: David Archuleta, Jason Castro, David Cook, Kristy Lee Cook, Chikezie Eze, David Hernandez, Michael Johns, Ramiele Malubay, Syesha Mercado, Amanda Overmyer, Carly Smithson, and Brooke White.