Kelly Clarkson & Jason Aldean

(Photo by Kevin Winter/Getty Images)

Bruno Mars

(Photo by Kevin Winter/Getty Images)

Bruno Mars

AFP PHOTO Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

Brno Mars

(Photo by Kevin Winter/Getty Images)

Bruce Springsteen

(Photo by Kevin Winter/Getty Images)

Bonnie Raitt & Alicia Keys

(Photo by Kevin Winter/Getty Images)

Bruno Mars

(Photo by Kevin Winter/Getty Images)

Alicia Keys

AFP PHOTO Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

Adam Levine of Maroon 5

(Photo by Kevin Winter/Getty Images)

Alicia Keys

(Photo by Kevin Winter/Getty Images)

Katy Perry

(Photo by Kevin Winter/Getty Images)

Rihanna & Chris Martin from Coldplay

(Photo by Kevin Winter/Getty Images)

Blake Shelton

(Photo by Kevin Winter/Getty Images)

beach Boys & Maroon 5

(Photo by Kevin Winter/Getty Images)

Stevie Wonder

AFP PHOTO Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

Taylor Swift

(Photo by Kevin Winter/Getty Images)

Katy Perry

(Photo by Kevin Winter/Getty Images)

Adele

(Photo by Kevin Winter/Getty Images)

Rihanna

(Photo by Kevin Winter/Getty Images)

Adele

(Photo by Kevin Winter/Getty Images)

Nicki Minaj

AFP PHOTO Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

Whitney Houston shown while Jennifer Hudson sang

(Photo by Kevin Winter/Getty Images)

(Photo by Kevin Winter/Getty Images)

Jennifer Hudson sings tribute to Whitney Houston

(Photo by Kevin Winter/Getty Images)

Nicki Minaj

(Photo by Kevin Winter/Getty Images)

Sir Paul McCartney and Bruce Springsteen

Getty Images

Mark Foster of the band Foster the People

(Photo by Kevin Winter/Getty Images)

Taylor Swift

(Photo by Kevin Winter/Getty Images)

The Beach Boys & Adam Levine of Maroon 5

(Photo by Kevin Winter/Getty Images)

Dave Grohl of Foo Fighters & Sir Paul McCartney

(Photo by Kevin Winter/Getty Images)

Sir Paul McCartney

Paul McCartney / (Photo by Kevin Winter/Getty Images)

Paul McCartney / (Photo by Kevin Winter/Getty Images)

Mike Love of The Beach Boys

(Photo by Kevin Winter/Getty Images)

Chris Martin of Coldplay

(Photo by Kevin Winter/Getty Images)

Rihanna & Coldplay

(Photo by Kevin Winter/Getty Images)

Foo Fighters

(Photo by Jason Merritt/Getty Images)

Katy Perry

(Photo by Kevin Winter/Getty Images)

Sir Paul McCartney

(Photo by Kevin Winter/Getty Images)

Carrie Underwood & Tony Bennett

(Photo by Kevin Winter/Getty Images)

Deadmau5

(Photo by Jason Merritt/Getty Images)

Bonnie Raitt

(Photo by Kevin Winter/Getty Images)

Bruce Springsteen

(Photo by Kevin Winter/Getty Images)

Chris Brown

(Photo by Jason Merritt/Getty Images)

Chris Brown & David Guetta

(Photo by Jason Merritt/Getty Images)

Chris Brown

(Photo by Kevin Winter/Getty Images)

The Band Perry

(Photo by Kevin Winter/Getty Images)