20. Bruno Mars - When I Was Your Man
LOS ANGELES, CA - FEBRUARY 12: Bruno Mars arrives at the 54th Annual GRAMMY Awards held at Staples Center on February 12, 2012 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)
19. One Direction - Kiss You
LONDON, ENGLAND - FEBRUARY 20: Harry Styles and Niall Horan of One Direction perform on stage during the Brit Awards 2013 at the 02 Arena on February 20, 2013 in London, England. (Photo by Matt Kent/Getty Images)
18. Rihanna - Stay
Singer Rihanna performs live on stage as part of her 777 tour at The Forum on November 19, 2012 in London, England.
17. Ne-Yo - Let Me Love You
Ne-Yo poses on arrival on the red carpet for the MTV Video Music Awards in Los Angeles on September 6, 2012 in California. AFP PHOTO / Frederic J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/GettyImages)
16. Pitbull / Christina Aguilera - Feel This Moment
<> on August 9, 2012 in Los Angeles, California.
15. Flo Rida - I Cry
PASADENA, CA - SEPTEMBER 16: Rapper Flo Rida performs onstage at the 2012 NCLR ALMA Awards at Pasadena Civic Auditorium on September 16, 2012 in Pasadena, California. (Photo by Jesse Grant/Getty Images for NCLR)
14. Justin Bieber / Nicki Minaj - Beauty And A Beat
at The Staples Center on October 2, 2012 in Los Angeles, California.
13. Justin Bieber - All Around The World
NEW YORK, NY - FEBRUARY 05: Justin Bieber visits "Late Night With Jimmy Fallon" at Rockefeller Center on February 5, 2013 in New York City. (Photo by Theo Wargo/Getty Images)
12. Olly Murs - Troublemaker
LONDON, ENGLAND - JANUARY 16: Singer Olly Murs speaks on stage during the official launch to mark the FA's 150th Anniversary Year at the Grand Connaught Rooms on January 16, 2013 in London, England. (Photo by Ian Walton/Getty Images)
11. Ke$ha - C'Mon
LOS ANGELES, CA - NOVEMBER 18: Singer Kesha attends the 40th American Music Awards held at Nokia Theatre L.A. Live on November 18, 2012 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)
10. Ke$ha - Die Young
arrives at the 2012 MTV Video Music Awards at Staples Center on September 6, 2012 in Los Angeles, California.
9. Maroon 5 - Daylight
XXX performs during the 2012 F1 Singapore on September 22, 2012 in Singapore.
8. Justin Timberlake - Suit & Tie
Justin Timberlake arrives for the premiere of 'Trouble With The Curve' on September 19, 2012 at the Regency Village Theatre in Westwood, California. AFP PHOTO/JOE KLAMAR (Photo credit should read JOE KLAMAR/AFP/GettyImages)
7. Calvin Harris / Florence Welch - Sweet Nothing
LOS ANGELES, CA - SEPTEMBER 06: DJ Calvin Harris poses in the press room during the 2012 MTV Video Music Awards at Staples Center on September 6, 2012 in Los Angeles, California. (Photo by Frederick M. Brown/Getty Images)
6. Alicia Keys - Girl On Fire
Alicia Keys performs onstage at iHeartRadio Live Presents Alicia Keys at iHeartRadio Theater on November 27, 2012 in New York City.
5. Taylor Swift - I Knew You Were Trouble
on stage during the Brit Awards 2013 at the 02 Arena on February 20, 2013 in London, England.
4. Bruno Mars - Locked Out Of Heaven
performs onstage at the 54th Annual GRAMMY Awards held at Staples Center on February 12, 2012 in Los Angeles, California.
3.Swedish House Mafia - Don't You Worry Child
NEW YORK, NY - DECEMBER 16: (FOR EDITORIAL USE ONLY) DJ's Axwell, Steve Angello and Sebastian Ingrosso of Swedish House Mafia perform at Madison Square Garden on December 16, 2011 in New York City. (Photo by Michael Loccisano/Getty Images)
2. Will.I.Am/Britney Spears - Scream & Shout
at a taping of We Will Always Love You: A GRAMMY Salute To Whitney Houston on October 11, 2012 at the Nokia Theatre L.A. LIVE in Los Angeles, California. The show airs November 16, 2012.
1. Macklemore - Thrift Shop
SEATTLE - APRIL 08: Seattle recording artist Macklemore performs a tribute to Mariners broadcaster Dave Niehaus, who passed away last November, prior to the Mariners' home opener against the Cleveland Indians at Safeco Field on April 8, 2011 in Seattle, Washington. (Photo by Otto Greule Jr/Getty Images)