Adam and Allison: 'Idol' Dream Team

Only four rockers are left in the competition to become the next "American Idol" -- and it looks like frontrunner Adam Lambert and Allison Iraheta aren't going anywhere after their stellar duet!

Adam, Allison, Danny Gokey and Kris Allen all performed solos and duets for the rock-themed show, but it was Adam and Allison's performance of Foghat's "Slow Ride" that impressed the judges. "In the battle of duets, you win the show tonight," Simon told the singers, adding that Lambert may have given Iraheta, 17, a chance to stay in the competition.

Unsurprisingly, Adam nailed his Led Zeppelin solo, for which Kara DioGuardi labeled him "a rock god." Simon chimed in, "The problem is, nobody can top that now." Kara, Paula, Randy and Simon felt that Allison's solo fell short, and she chose the wrong song, which made the wine-haired teen bristle.

Danny and Kris gave their all to their duet "Renegade." While Randy and Kara enjoyed their voices together, Simon said that Allen paled in comparison to Gokey.

The judging panel harshly criticized Allen for his solo performance of the Beatles' "Come Together." Cowell compared the rendition to "eating ice for lunch... meaning it leaves you with nothing to remember afterward." Danny also received a mediocre response from the judges after belting Aerosmith's "Dream On," with a massive scream at the end, which Simon likened to a horror movie.