What Doesn't Kill You (Stronger)

What Doesn't Kill You (Stronger) by Kelly Clarkson is featured in the fourteenth episode of season three, On My Way. It is performed by The Troubletones as Mr. Schuester and Rachel agreed to let The Troubletones to have at least one number in all competitions. 

Lyrics
The Troubletones: Ah, Ah, Ah, Ah, Ah, Ah, Ah, Ah, Ah, Ah, Ah, Ah, Ah, Ah, Ah, Ah.

Santana (with The Troubletones harmonizing): You know the bed feels warmer Sleepin' here alone (Sleepin' here alone) You know I dream in color And do the things I want

Brittany: You think you got the best of me Think you've had the last laugh Bet you think that everything good is gone Think you left me broken down Think that I'd come running back Baby you don't know me, cause you're dead wrong

Mercedes with The Troubletones: What doesn't kill you makes you stronger Stand a little taller Doesn't mean I'm lonely when I'm alone What doesn't kill you makes a fighter Footsteps even lighter Doesn't mean I'm over cause you're gone...

What doesn't kill you makes you stronger, stronger Just me, myself and I What doesn't kill you makes you stronger Stand a little taller Doesn't mean I'm lonely when I'm alone

Mercedes and Santana: You heard that I was starting over with someone new They told you I was moving on, over you

Brittany: You didn't think that I'd come back I'd come back swinging You try to break me, but you see

Mercedes with The Troubletones: What doesn't kill you makes you stronger

The Troubletones: Stand a little taller

Mercedes with the Troubletones: Doesn't mean I'm lonely when I'm alone

The Troubletones: What doesn't kill you makes a fighter

Mercedes with the Troubletones: Footsteps even lighter Doesn't mean I'm over cause you're gone What doesn't kill you makes you stronger, stronger Just me, myself and I

The Troubletones: What doesn't kill you

Mercedes with the Troubletones: makes you stronger Stand a little taller Doesn't mean I'm lonely when I'm alone

Santana: Thanks to you I've got a new thing started

Mercedes: Thanks to you I'm not the broken-hearted

Santana: Thanks to you I'm finally thinking about me

Mercedes and Santana: You know in the end the day you left was just my beginning

Santana: In the end...

Mercedes and Santana with The Troubletones: What doesn't kill you makes you stronger

Santana with The Troubletones: Stand a little taller Doesn't mean I'm lonely when I'm alone

Mercedes and Santana with The Troubletones: What doesn't kill you makes a fighter Footsteps even lighter Doesn't mean I'm over cause you're gone

Santana with The Troubletones: What doesn't kill you makes you stronger, stronger (Mercedes: stronger, stronger) Just me, myself and I (Brittany: What doesn't kill you) What doesn't kill you makes you stronger (Mercedes: stronger) Stand a little taller (Mercedes: taller) Doesn't mean I'm lonely when I'm alone (Brittany: What doesn't kill you) (Mercedes: not alone)

Stronger, stronger Just me, myself and I (Mercedes: yeah) (Brittany: What doesn't kill you) What doesn't kill you makes you stronger (Mercedes: stronger) Stand a little taller (Mercedes: stronger) Doesn't mean I'm lonely when I'm alone (Brittany: What doesn't kill you) (Mercedes: not alone)

The Troubletones: Ah, Ah, Ah, Ah, Ah, Ah, Ah, Ah, Ah, Ah, Ah, Ah, Ah, Ah, Ah, Ah, Ah.

Trivia

 * The song was going to be called Stronger (What Doesn't Kill You) but was then changed to What Doesn't Kill You (Stronger)
 * Second song used on Glee to have "Stronger" in the title, the first being Stronger sung by Artie in the Season Two episode entitled Britney/Brittany.
 * The song is the second number of the New Directions Regionals setlist.