Question: Which actors on "Glee" performed "Stronger"?
About the article "Stronger (What Doesn't Kill You)", section "Cover versions".

Candidate passages:
Clarkson first performed the song during a Sony-sponsored special concert at The Troubador in Los Angeles on October 19, 2011 to promote "Stronger".
She then performed it as the opening song in the "VH1 Unplugged: Kelly Clarkson" television special on November 17, 2011.
Clarkson also included the song as the opening performance of her Stronger Tour.
Clarkson performed the song at the 2012 Billboard Music Awards on May 20, 2012.
Two days later, on May 22, 2012, she performed the song along with "Stronger (What Doesn't Kill You)" on the fourteenth season finale of "Dancing with the Stars".
On June 5, 2012, Clarkson performed the acoustic version of "Dark Side" in BBC Radio 1's Live Lounge.
She performed the song on British daytime television show "Loose Women".
On June 9, 2012, she performed the song at Wembley Stadium as a part of her setlist of Summertime Ball.
Clarkson performed "Dark Side" along with 'Stronger (What Doesn't Kill You)' on MuchMusic Video Awards on June 17, 2012.
The song was performed by Darren Criss on "Glee"s fourth season episode "Dynamic Duets", which aired on November 22, 2012. 
The song was performed on an episode of "Glee". 
The songs performed in the episode were all featured on the Christmas album "," which was released December 11, 2012.
Therefore, the songs were not sold as singles. 
Spears first performed the song live on 2000's Oops!...
I Did It Again World Tour.
The show began with the video introduction "The Britney Spears Experience", in which three images of Spears welcomed spectators to the show.
Then, a giant metal orb was lowered onstage and lifted again to reveal Spears standing behind it.
Wearing a glittery jeans and an orange halter top, she opened the show with a dance-oriented performance of the song.
"Stronger" was last performed on 2002's Dream Within a Dream Tour.
After a dance-oriented performance of "Boys", Spears performed the song, in which she wore a paint-covered robe and in some shows a bowler hat.
Spears also performed the song on several television appearances, including on the American Music Awards of 2001, and on a MTV special titled "Total Britney Live".
A Fox special titled "Britney In Hawaii", aired on June 8, 2000, included an exclusive performance of the song.
A performance of "Stronger" live from Germany was broadcast on Radio Music Awards of 2000, since Spears was on tour by the time of the awards.
"Stronger" was not included on the set lists of any of Spears' tours until it was included in her Las Vegas residency show .
"Stronger" was covered by Kevin McHale on TV series "Glee", on an episode titled "Britney/Brittany", that was dedicated to the singer.
In the episode, McHale's character Artie has a hallucination of himself singing "Stronger" during a dental visit.
The cover received positive reviews from contemporary music critics.
Raymund Flandez of "The Wall Street Journal" enjoyed the cover version, appreciating the twist of having males sing a feminist empowerment song, while Tim Stack of "Entertainment Weekly" deemed "Stronger" his favorite performance of the episode, as well as the best incorporation of Spears' music, as the song served Artie's storyline. 
The song was performed by Melissa Benoist on the 2012 episode "The New Rachel" of "Glee".