#20 Alex Clare - Too Close

#19 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)

#18 Bruno Mars - Locked Out of Heaven

NEW YORK, NY - APRIL 03: Bruno Mars performs during the 2012 Concert for the Rainforest Fund at Carnegie Hall on April 3, 2012 in New York City. (Photo by Jamie McCarthy/Getty Images)

#17 The Wanted - I Found You

LOS ANGELES, CA - SEPTEMBER 06: From L to R: Nathan Sykes, Siva Kaneswaran, Jay McGuiness, Tom Parker and Max George from "The Wanted" attend In Touch Weekly's 5th Annual 2012 Icons + Idols at Chateau Marmont on September 6, 2012 in Los Angeles, California. (Photo by Valerie Macon/Getty Images)

#16 Katy Perry - Wide Awake

US singer and actress Katy Perry gestures to Japanese fans upon her arrival at the Japanese premiere of her movie "Katy Perry: Part of Me 3D" at a Tokyo theatre on September 25, 2012. Perry is now here to promote the film. AFP PHOTO / Yoshikazu TSUNO (Photo credit should read YOSHIKAZU TSUNO/AFP/GettyImages)

#15 Taylor Swift - We Are Never Getting Back Together

LAS VEGAS, NV - SEPTEMBER 22: Singer Taylor Swift performs onstage during the 2012 iHeartRadio Music Festival at the MGM Grand Garden Arena on September 22, 2012 in Las Vegas, Nevada. (Photo by Michael Kovac/Getty Images for Clear Channel)

#14 Enrique Inglesias - Finally Found You f/ S. Adams

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

#13 The Wonder Girls - Like Money f/ Akon

The Wondergirls, a K-pop band from South Korea, enter the stage before their performance at the Music Bank K-pop festival concert in Hong Kong on June 23, 2012. Various K-pop artists from South Korea are in Hong Kong to perform at the Music Bank World Tour that has included concerts in Tokyo and Paris. AFP PHOTO / Antony DICKSON (Photo credit should read ANTONY DICKSON/AFP/GettyImages)

#12 Karmin - Hello

LOS ANGELES, CA - SEPTEMBER 07: Singers Nick Noonan and Amy Heidemann of Karmin perform onstage at Macy's Passport Presents: Glamorama - 30th Anniversary in Los Angeles held at The Orpheum Theatre on September 7, 2012 in Los Angeles, California. (Photo by Christopher Polk/Getty Images)

#11 Flo Rida - Whistle

BERLIN, GERMANY - SEPTEMBER 20: Flo Rida performs on stage during the Popstars Live Final Show on September 20, 2012 in Berlin, Germany. (Photo by Luca Teuchmann/Getty Images)

#10 Ke$ha - Die Young

LOS ANGELES, CA - SEPTEMBER 06: Singer Ke$ha arrives at the 2012 MTV Video Music Awards at Staples Center on September 6, 2012 in Los Angeles, California. (Photo by Christopher Polk/Getty Images)

#9 Rihanna - Diamonds

LAS VEGAS, NV - SEPTEMBER 21: Singer Rihanna performs onstage during the 2012 iHeartRadio Music Festival at the MGM Grand Garden Arena on September 21, 2012 in Las Vegas, Nevada. (Photo by Christopher Polk/Getty Images for Clear Channel)

#8 Justin Bieber - As Long As You Love Me

LOS ANGELES, CA - OCTOBER 02: Singer Justin Bieber performs during his "Believe" tour at The Staples Center on October 2, 2012 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)

#7 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)

#6 Nicki Minaj - Pound The Alarm

NEW YORK, NY - SEPTEMBER 24: Nicki Minaj attends the Nicki Minaj "Pink Friday" Fragrance Launch Event at Macy's Herald Square on September 24, 2012 in New York City. (Photo by Dave Kotinsky/Getty Images)

#5 Ne-Yo - Let Me Love You

LAS VEGAS, NV - SEPTEMBER 22: Singer/songwriter Ne-Yo performs onstage during the 2012 iHeartRadio Music Festival at the MGM Grand Garden Arena on September 22, 2012 in Las Vegas, Nevada. (Photo by Isaac Brekken/Getty Images for Clear Channel)

#4 P!nk - Blow Me (One Last Kiss)

MELBOURNE, AUSTRALIA - OCTOBER 04: Singer Pink performs for fans at The Forum Theatre on October 4, 2012 in Melbourne, Australia. Pink is in Australia promoting her latest album, The Truth About Love. (Photo by Scott Barbour/Getty Images)

#3 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)

#2 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)

#1 PSY - Gangnam Style

NEW YORK, NY - SEPTEMBER 14: South Korean rapper Psy performs on NBC's "Today" at Rockefeller Plaza on September 14, 2012 in New York City. (Photo by Mike Coppola/Getty Images)