Overview:Tonight the Top 7 finalists will perform live for the nation, vying for the American Idol crown. The contestants will perform their hearts out in hopes of winning America's vote and surviving another week. Tune in to see who impresses the judges and who buckles under the pressure. Tonight's Theme Is: Mariah Carey songs Performing Tonight are: David Archuleta Jason Castro David Cook Kristy Lee Cook Syesha Mercado Carly Smithson Brooke White