Overview: 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.Tonight's theme is: Diana Ross songs Performing Tonight are: Blake Lewis Brandon Rogers Chris Richardson Chris Sligh Phil Stacey Sanjaya Malakar Gina Glocksen Haley Scarnato Jordin Sparks Lakisha Jones Melinda Doolittle Stephanie Edwards