20. One Direction - Kiss You
LONDON, UNITED KINGDOM - OCTOBER 07: Liam Payne, Louis Tomlinson, Niall Horan, Zayn Malik and Harry Styles of 'One Direction' attend the BBC Radio 1 Teen Awards on October 7, 2012 in London, England. (Photo by Stuart Wilson/Getty Images)
19. Justin Bieber - As Long As You Love Me
LOS ANGELES, CA - JUNE 26: Singer Justin Bieber arrives at the BET Awards '11 held at the Shrine Auditorium on June 26, 2011 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)
18. Ke$ha - C'Mon
arrives at the 2012 MTV Video Music Awards at Staples Center on September 6, 2012 in Los Angeles, California.
17. Justin Timberlake - Suit & Tie
during the Opening Ceremony for the 39th Ryder Cup at Medinah Country Club on September 27, 2012 in Medinah, Illinois.
16. Trey Songz - Heart Attack
ATLANTA, GA - AUGUST 26: Trey Songz attends Heineken Red Star Access Atlanta featuring Trey Songz, Kendrick Lamar and DJ MLK hosted by Affion Crockett at Opera Nightclub on August 26, 2012 in Atlanta, Georgia. (Photo by Moses Robinson/Getty Images for Heineken)
15. Usher/Ludacris/David Guetta - Rest Of My Life
LOS ANGELES, CA - JUNE 29: Singer Usher attends day 1 of the 2012 BET Awards Radio Room held at The Shrine Auditorium on June 29, 2012 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images For BET)
14. 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)
13. 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)
12. Ed Sheeran - The A Team
CHELMSFORD, ENGLAND - AUGUST 18: Ed Sheeran performs on The Arena Stage on day 1 of the V Festival at Hylands Park on August 18, 2012 in Chelmsford, England. (Photo by Samir Hussein/Getty Images)
11. Pitbull/Christina Aguilera - Feel This Moment
LOS ANGELES, CA - NOVEMBER 18: (L-R) Singer Christina Aguilera and rapper Pitbull perform onstage during the 40th American Music Awards held at Nokia Theatre L.A. Live on November 18, 2012 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)(Photo by Kevin Winter/Getty Images)
10. The Lumineers - Ho Hey
NASHVILLE, TN - DECEMBER 05: Wesley Schultz, Neyla Pekarek, and Jeremiah Fraites of The Lumineers speak onstage at The GRAMMY Nominations Concert Live!! held at Bridgestone Arena on December 5, 2012 in Nashville, Tennessee. (Photo by Kevin Winter/Getty Images)
9. 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)
8. Pitbull - Don't Stop The Party
<> on August 9, 2012 in Los Angeles, California.
7. 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)
6. Ke$ha - Die Young
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)
5. Taylor Swift - I Knew You Were Trouble
attends the 39th Annual People's Choice Awards at Nokia Theatre L.A. Live on January 9, 2013 in Los Angeles, California.
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. 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)
2. Justin Bieber/ Nicki Minaj - Beauty And A Beat
at The Staples Center on October 2, 2012 in Los Angeles, California.
1. Britney Spears/ Will.I.Am - 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.