20. One Direction - Live While We're Young

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. Ellie Goulding - Lights

HOLLYWOOD, CA - APRIL 11: Singer Ellie Goulding performs at the Third Annual ELLE Women In Music Event at Avalon on April 11, 2012 in Hollywood, California. (Photo by Michael Buckner/Getty Images)

18. Flo Rida - Whistle

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)

17. Calvin Harris/ Ne-Yo - Let's Go

HOLMDEL, NJ - MAY 20: DJ Calvin Harris spins onstage at 103.5 KTU's KTUphoria at PNC Bank Arts Center on May 20, 2012 in Holmdel City, New Jersey. (Photo by Brian Ach/Getty Images)

16. Gym Class Heros/Adam Levine - Stereo Hearts

AUBURN HILLS, MI - APRIL 5: Travie McCoy and the Gym Class Heroes perform at halftime of a game between the Washington Wizards and Detroit Pistons on April 5, 2012 at The Palace of Auburn Hills in Auburn Hills, Michigan. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and/or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. Mandatory Copyright Notice: Copyright 2012 NBAE (Photo by J. Dennis/Einstein/NBAE via Getty Images)

15. Psy - Gangnam Style

LOS ANGELES, CA - SEPTEMBER 06: (L-R) Host Kevin Hart and rapper Psy speak onstage during the 2012 MTV Video Music Awards at Staples Center on September 6, 2012 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)

14. Nicki Minaj - Va Va Voom

LOS ANGELES, CA - AUGUST 08: Singer Nicki Minaj performs at the Nokia Theatre L.A. Live on August 8, 2012 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)

13. Kanye West - Mercy

LOS ANGELES, CA - JULY 01: Recording artist Kanye West accepts the award for Video of the Year onstage during the 2012 BET Awards at The Shrine Auditorium on July 1, 2012 in Los Angeles, California. (Photo by Michael Buckner/Getty Images For BET)

12. David Guetta/Sia - Titanium

French DJ David Guetta performs at the Arena in Treptow, Berlin, on July 8, 2012. AFP PHOTO / FREDERIC LAFARGUE (Photo credit should read FREDERIC LAFARGUE/AFP/GettyImages)

11. Enrique Iglesias/Sammy Adams - Finally Found You

LAS VEGAS, NV - SEPTEMBER 22: Recording artist Sammy Adams (L) and singer Enrique Iglesias perform onstage during the 2012 iHeartRadio Music Festival at the MGM Grand Garden Arena on September 22, 2012 in Las Vegas, Nevada. (Photo by Christopher Polk/Getty Images for Clear Channel)

10 Fun. - Some Nights

NEW YORK, NY - AUGUST 10: Lead singer Nate Ruess of the alternative rock band "fun." performs on stage during Pepsi Presents StePhest Colbchella '012: Rocktaugustfest on board the USS Intrepid Sea-Air-Space Museum on August 10, 2012 in New York City. (Photo by Neilson Barnard/Getty Images)

9. Trey Songs - 2 Reasons

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)

8. Rihanna - Diamonds

LOS ANGELES, CA - SEPTEMBER 06: Singer Rihanna arrives at the 2012 MTV Video Music Awards at Staples Center on September 6, 2012 in Los Angeles, California. (Photo by Frederick M. Brown/Getty Images)

7. Ke$ha - Die Young

arrives at the 2012 MTV Video Music Awards at Staples Center on September 6, 2012 in Los Angeles, California.

6. Flo Rida - I Cry

SANTA MONICA, CA - AUGUST 19: Flo Rida performs onstage during the 2012 Do Something Awards at Barker Hangar on August 19, 2012 in Santa Monica, California. (Photo by Kevin Winter/Getty Images for VH1)

5. Alex Clare - Too Close

Festival goers enjoy a set by a dubstep DJ at the "Lounge on the Farm" festival near Canterbury in Kent, on July 8, 2011. Five years ago, dubstep was just another fresh but obscure strain of dance music, limited almost exclusively to a handful of nightclubs in south London. Today it is taking over dancefloors worldwide. Born out of drum'n'bass and the 2-step UK garage movement which propelled Craig David to fame, dubstep completed its journey from quirky curiosity to commercial success story earlier this month (eds: earlier in July) when DJ Fresh's "Louder" hit the top of the UK singles chart. AFP PHOTO/Leon Neal

TO GO WITH AFP STORY BY JAMES PHEBY *BRITAIN-ENT-MUSIC-DUBSTEP* (Photo credit should read LEON NEAL/AFP/Getty Images)

4. Maroon 5 - One More Night

US music group Maroon 5 members (L-R) Matt Flynn, PJ Morton, Adam Levine, Mickey Madden and James Valentine pose for a picture during a press conference in Mexico City, on August 16, 2012. Maroon 5 is in Mexico for a series of concerts. AFP PHOTO/RONALDO SCHEMIDT (Photo credit should read Ronaldo Schemidt/AFP/GettyImages)

3. 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)

2. Justin Bieber - As Long As You Love Me

at The Staples Center on October 2, 2012 in Los Angeles, California.

1. Chris Brown - Don't Wake Me Up

LOS ANGELES, CA - SEPTEMBER 06: Singer Chris Brown accepts the award for Best Male Video onstage during the 2012 MTV Video Music Awards at Staples Center on September 6, 2012 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)