In the Season Two finale, Team Blake's Jermaine Paul did a smooth performance of the Jackson 5 song, "I Want You Back", with other Season Two fan favorites Jamar Rogers, James Massone, and Pip.
In Season 3's blind auditions, a contestant named VJ sang Cee Lo's "Forget You" hoping to win him over. While no one turned around for the guy, it did inspire Cee Lo to sing the song with him. It could also be considered a Moment of Funny because of the way VJ sang it and Cee Lo accidentally singing the actual version of the song for a moment (which was censored of course).
Also Season 3, Amanda Brown performing "Dream On" in the first round of the live playoffs. Holy shit can she wail that last part like Steven Tyler.
For the finale of that season, Kelly Clarkson singing Catch My Breath with finalists Cassadee Pope and Terry McDermott, especially seeing her outright cheer on Cassadee and the moment where she holds her smile at the lyrics "You helped me see The beauty in everythiiiing!" She's not the first and most successful international American Idol contestant, let alone winner, for nothing, and it comes full circle here.
Kris Thomas with his falsetto singing COMPLETELY fool the male judges in season 4
There was skepticism to NBC playing Follow the Leader to American Idol years after the singing competition craze had died down, with CBS and ABC already having their own failures in that area. The Voice now beats Idol in weekly ratings by several million viewers.
Taylor Swift showing up unexpectedly to help Michelle Chamuel rehearse I Knew You Were Trouble. I said unexpectedly because, Usher didn't call her. She just flew in because she heard that Michelle was singing her song.
During the blind auditions for the first series of The Voice UK, Alys Williams was so nervous that her voice literally stopped in the middle of her song. The judges nevertheless applauded her for trying, gave her some friendly advice, and complemented her on what they were able to hear. She came back to audition for the second series, and this time, her performance of Mumford & Sons "The Cave" convinced all four of the coaches to push their buttons.
After Jaz Ellington's note-perfect audition on the British series, in which he sang Ed Sheeran's "The A-Team", Will.i.am asked him to do something else. Ellington immediately launched into "Ordinary People", and put so much feeling and soul into it that both Jesse J and Will.i.am teared up. Will followed it up by talking about why he wrote that song, and what it meant to him.
Every winner has at least one moment.
Matthew Schueler's audition. He managed to turn all four chairs within seconds of singing. And while many people cried foul, he managed to prove that he deserved that response.