#20- Rihanna 'S&M'

PARIS, FRANCE - MAY 06: Rihanna performs live at the 'Nivea And Rihanna Celebrating 100 Years Of Skincare' at Grand Hotel Intercontinental on May 6, 2011 in Paris, France. (Photo by Franck Prevel/Getty Images)

#19- Britney Spears 'Til The World Ends'

SAN FRANCISCO, CA - MARCH 27: Britney Spears attends "Good Morning America's" Taping Performance At Bill Graham Civic Auditorium on March 27, 2011 in San Francisco, California. (Photo by Max Morse/Getty Images)

#18- Jason Aldean and Kelly Clarkson 'Don't You Wanna Stay'

NASHVILLE, TN - NOVEMBER 10: Jason Aldean and Kelly Clarkson perform "Dont You Wanna Stay" at the 44th Annual CMA Awards at the Bridgestone Arena on November 10, 2010 in Nashville, Tennessee. (Photo by Rick Diamond/Getty Images)

#17- 3 Doors Down 'When You're Young'

LAS VEGAS - JANUARY 9: In this photo provided by the Las Vegas News Bureau, band "3 Doors Down" performs at the 2007 International CES show January 9, 2007 in Las Vegas, Nevada. The world's largest consumer technology tradeshow runs through January 11 and features 2,700 exhibitors showing off their latest products and services to more than 150,000 attendees. (Photo by Darrin Bush/Las Vegas News Bureau via Getty Images)

#16- Pink 'Raise Your Glass'

LOS ANGELES, CA - NOVEMBER 21: Singer Pink (L) performs onstage during the 2010 American Music Awards held at Nokia Theatre L.A. Live on November 21, 2010 in Los Angeles, California. (Photo by Kevork Djansezian/Getty Images for DCP)

#15- Lady Gaga 'Born This Way'

CARLISLE, ENGLAND - MAY 15: Lady Gaga performs at Radio 1's Big Weekend 2011 at Carlisle Airport on May 15, 2011 in Carlisle, England. (Photo by Dave J Hogan/Getty Images)

#14- Plain White T's 'Rhythm of Love'

NEW YORK - AUGUST 18: (L-R) De'Mar Hamilton, Tom Higgenson, Tim Lopez, Dave Tirio and Mike Retondo of the Plain White T's attend the benefit the VH1 Save The Music Foundation at Bowlmor Lanes on August 18, 2010 in New York City. (Photo by Astrid Stawiarz/Getty Images)

#13- Bruno Mars 'Lazy Song'

CARLISLE, ENGLAND - MAY 15: (UK TABLOID NEWSPAPERS OUT) Bruno Mars performs at Radio 1's Big Weekend 2011 at Carlisle Airport on May 15, 2011 in Carlisle, England. (Photo by Dave Hogan/Getty Images)

#12- Mike Posner 'Cooler Than Me'

ZURICH, SWITZERLAND - NOVEMBER 06: Mike Posner performs during the fourth day of the Charles Vogele Fashion Days on November 6, 2010 in Zurich, Switzerland. (Photo by The Image Gate/Getty Images for IMG)

#11- Avril Lavigne 'What The Hell'

NEW YORK, NY - MARCH 08: Avril Lavigne attends the release party for Avril Lavigne's new album "Goodbye Lullaby" at SL Lounge on March 8, 2011 in New York City. (Photo by D Dipasupil/Getty Images)

#10- Train 'If It's Love'

LOS ANGELES, CA - APRIL 27: Singer Pat Monahan of Train performs onstage at the 28th Annual ASCAP Pop Music Awards at the Kodak Ballroom on April 27, 2011 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)

#9- My Chemical Romance 'Sing'

CARLISLE, ENGLAND - MAY 15: (UK TABLOID NEWSPAPERS OUT) Gerard Way of My Chemical Romance performs at Radio 1's Big Weekend 2011 at Carlisle Airport on May 15, 2011 in Carlisle, England. (Photo by Dave Hogan/Getty Images)

#8- Taio Cruz 'Dynamite'

CARLISLE, ENGLAND - MAY 15: (UK TABLOID NEWSPAPERS OUT) Taio Cruz performs at Radio 1's Big Weekend 2011 at Carlisle Airport on May 15, 2011 in Carlisle, England. (Photo by Dave Hogan/Getty Images)

#7- OneRepublic 'Good Life'

NEW YORK - NOVEMBER 12: (L-R) Musicians Ryan Tedder, Drew Brown, Brent Kutzle, Zach Filkins and Eddie Fisher of the band OneRepublic visit fuse TV's "Let it Rock" at fuse Studios on November 12, 2009 in New York City. (Photo by Bryan Bedder/Getty Images)

#6- Katy Perry 'Firework'

MELBOURNE, AUSTRALIA - MAY 01: Singer Katy Perry arrives on the red carpet ahead of the 2011 Logie Awards at Crown Palladium on May 1, 2011 in Melbourne, Australia. (Photo by Ryan Pierse/Getty Images)

#5- Katy Perry 'E.T.'

MELBOURNE, AUSTRALIA - APRIL 30: Singer Katy Perry attends the launch of her new fragrance 'Purr' at Myer, Bourke Street on April 30, 2011 in Melbourne, Australia. (Photo by Graham Denholm/Getty Images)

#4- Pink 'Perfect'

LOS ANGELES, CA - NOVEMBER 21: Singer Pink arrives at the 2010 American Music Awards held at Nokia Theatre L.A. Live on November 21, 2010 in Los Angeles, California. (Photo by Jason Merritt/Getty Images for DCP)

#3- Bruno Mars 'Grenade'

CARLISLE, ENGLAND - MAY 15: (UK TABLOID NEWSPAPERS OUT) Bruno Mars performs at Radio 1's Big Weekend 2011 at Carlisle Airport on May 15, 2011 in Carlisle, England. (Photo by Dave Hogan/Getty Images)

#2- The Script 'For The First Time'

CARLISLE, ENGLAND - MAY 15: (UK TABLOID NEWSPAPERS OUT) Danny O'Donoghue of The Script performs at Radio 1's Big Weekend 2011 at Carlisle Airport on May 15, 2011 in Carlisle, England. (Photo by Dave Hogan/Getty Images)

#1- Adele 'Rolling In The Deep'

BERLIN, GERMANY - MARCH 24: Singer Adele performs at the Echo Awards 2011 at Palais am Funkturm on March 24, 2011 in Berlin, Germany. (Photo by Sean Gallup/Getty Images)