With just seven Idol hopefuls making it through to the reality series' next round, only Sparks and Daughtry managed to get both of their respective mentees into the live competition. Of course, it doesn't hurt to have pipes like Trent Harmon or Dalton Rapattoni.
Sparks and Harmon slayed with the Bee Gees' "To Love Somebody," with the former even gushing at one point: "He's so good, I don't even want to sing!" See the performance below.
Equally impressive was Manny Torres' take on Sparks' 2007 collaboration with Chris Brown, "No Air."
Meanwhile, Rapattoni couldn't help but confess to his mentor that the first CD he ever held -- a Christmas gift -- was Daughtry's self-titled 2006 debut. The pair later rocked out to Stevie Wonder's "Higher Ground," which Daughtry performed in the top 12 round of his Idol season.
"I always felt like I could have done that song better, so I want to have my chance," he said.
The performance was extra sweet for the 36-year-old singer, who was surprised onstage with a special career-spanning plaque from his record label.
Daughtry also took on one of his biggest hits, "Home," with superfan Lee Jean -- earning high praise from all three judges. "That's one of the best guys to ever come out of Idol, and you were singing with him and you're a baby still -- and the two of you together -- I'm speechless," Jennifer Lopez said with a laugh.
Kellie Pickler, David Cook and Constantine Maroulis also saw success with their respective mentees, helping push Tristan Harmon, Olivia Rox and Jenn Blosil all through to the next round of the competition.
Which Idol duet was your favorite so far? Hit the comments with your picks!