"American Idol" finalists performed songs written from the current century, in an episode themed "21st Century Night."
Teaming up to sing Train's hit song "Hey Soul Sister" were Jacob Lusk, Stefano Langone, Lauren Alaina and Haley Reinhart. Following their performance were Casey Abrams, Scotty McCreery and James Durbin, who sang "Viva la Vida."
In a flickering bodysuit, Katy Perry walked on stage and performed "E.T." with a surprise guest appearance from Kanye West. Season 7 "Idol" winner David Cook returned to the stage and sang his new single, "The Last Goodbye."
With the tension building, Seacrest announced Reinhart and Jacob Lusk were safe -- sending Stefano Langone packing.
Steven Tyler stated that none of the finalists deserve to go home at this point. "A lot of love is coming their way soon," the rocker predicted.
The 6 finalists that remain are Casey Abrams, Lauren Alaina, James Durbin, Scott McCreery, Haley Reinhart and Jacob Lusk.