Tonight the Top 9 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 in the competition. See who impresses the judges and who buckles under the pressure. Tonight's theme: Classic Musicals. Performing tonight: Anthony Fedorov, Anwar Robinson, Constantine Maroulis, Harold "Bo" Bice, Nikko Smith, Scott Savol, Carrie Underwood, Nadia Turner, and Vonzell Solomon.