#20 Karmin - Brokenhearted

Amy Heidemann of Karmin poses in the press room during the 2011 American Music Awards at the Nokia Theatre L.A. Live on November 20, 2011 in Los Angeles, California.
AFP PHOTO / ADRIAN SANCHEZ-GONZALEZ (Photo credit should read ADRIAN SANCHEZ-GONZALEZ/AFP/Getty Images)

#19 One Direction - What Makes You Beautiful

NEW YORK, NY - MAY 26: (L-R) Louis Tomlinson, Harry Styles, Liam Payne, Zayn Malik and Niall Horan of British boy band One Direction perform live on stage at the Beacon Theatre on May 26, 2012 in New York City. (Photo by Neilson Barnard/Getty Images)

#18 Katy Perry - Wide Awake

CENTURY CITY, CA - MAY 10: Singer Katy Perry attends the NARM Music Biz Awards dinner party held at the Hyatt Regency Century Plaza on May 10, 2012 in Century City, California. (Photo by Jason Merritt/Getty Images)

#17 Calvin Harris - Let's Go ft. Ne-Yo

DOUGLAS, ISLE OF MAN - JUNE 19: Calvin Harris performs at the Isle Of Man Bay Festival on June 19, 2010 in Douglas, Isle Of Man. (Photo by Gareth Cattermole/Getty Images)

#16 Pitbull - Back In Time

NEW YORK, NY - MAY 23: Singer Pitbull performs at the "Men In Black 3" New York Premiere after party at the USS Intrepid on May 23, 2012 in New York City. (Photo by Stephen Lovekin/Getty Images)

#15 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)

#14 Maroon 5 - Payphone ft. Wiz Khalifa

LAS VEGAS - FEBRUARY 11: Music group Maroon 5 perform onstage at the Sports Illustrated Swimsuit 24/7: Club SI Swimsuit at Vanity Nightclub At The Hard Rock Hotel And Casino on February 11, 2010 in Las Vegas, Nevada. (Photo by Michael Loccisano/Getty Images for Sports Illustrated)

#13 Havana Brown - We Run The Night ft. Pitbull

SYDNEY, AUSTRALIA - NOVEMBER 20: DJ Havana Brown arrives at Singstar's Take 40 Stars of Summer party at the "PlayStation Mansion" on November 20, 2010 in Sydney, Australia. (Photo by Lisa Maree Williams/Getty Images)

#12 Usher - Scream

Photo by Frazer Harrison/Getty Images for ABC

LAS VEGAS, NV - MAY 20: Usher arrives at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

#11 Justin Bieber - Boyfriend

MILAN, ITALY - JUNE 02: Justin Bieber performs at Alcatraz on June 2, 2012 in Milan, Italy. (Photo by Vittorio Zunino Celotto/Getty Images)

#10 Katy Perry - Part Of Me

LOS ANGELES, CA - MARCH 31: Singer Katy Perry arrives at Nickelodeon's 25th Annual Kids' Choice Awards held at Galen Center on March 31, 2012 in Los Angeles, California. (Photo by John Shearer/Getty Images for KCA)

#9 Nicki Minaj - Starships

LONDON, ENGLAND - APRIL 19: Nicki Minaj signs copies of her number one album 'Pink Friday: Roman Reloaded' at HMV Whiteleys on April 19, 2012 in London, England. (Photo by Danny Martindale/Getty Images)

#8 Drake - The Motto ft. Lil Wayne

ORLANDO, FL - FEBRUARY 26: Lil Wayne and Drake pose for a photograph during the 2012 NBA All-Star Game presented by Kia Motors as part of 2012 All-Star Weekend at the Amway Center on February 26, 2012 in Orlando, Florida. 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 Bruce Yeung/NBAE via Getty Images)

#7 The Wanted - Glad You Came

NEW YORK, NY - APRIL 25: Siva Kaneswaran, Jay McGuiness and Nathan Sykes of The Wanted perform on stage at "fuse Live" at fuse Studios on April 25, 2012 in New York City. (Photo by Neilson Barnard/Getty Images)

#6 Carly Rae Jepsen - Call Me Maybe

LONDON, UNITED KINGDOM - JUNE 09: Carly Rae Jepsen attends The Capital FM Summertime Ball 2012 at Wembley Stadium on June 9, 2012 in London, United Kingdom. (Photo by Stuart Wilson/Getty Images)

#5 Adele - Rumour Has It

Musician Adele poses with her six trophies at the 54th Grammy Awards in Los Angeles, California, February 12, 2012. AFP PHOTO/ FREDERIC J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)

#4 Gotye - Somebody That I Used To Know ft. Kimbra

INDIO, CA - APRIL 15: Singer Kimbra aka Kimbra Johnson and Musician Wouter "Wally" De Backer aka Gotye performs during Day 3 of the 2012 Coachella Valley Music & Arts Festival held at the Empire Polo Club on April 15, 2012 in Indio, California. (Photo by Michael Buckner/Getty Images for Coachella)

#3 Fun. - We Are Young ft. Janelle Monae

UNIVERSAL CITY, CA - JUNE 03: Singer Nate Ruess of Fun. performs onstage during the 2012 MTV Movie Awards held at Gibson Amphitheatre on June 3, 2012 in Universal City, California. (Photo by Kevin Winter/Getty Images)

#2 Rihanna - Where Have You Been

LOS ANGELES, CA - MAY 23: Singer Rihanna performs onstage during Fox's "American Idol 2012" results show at Nokia Theatre L.A. Live on May 23, 2012 in Los Angeles, California. (Photo by Mark Davis/Getty Images)

#1 Flo Rida - Wild Ones ft. Sia

LOS ANGELES, CA - JUNE 4: Rapper Flo Rida performs to promote the newest version of video game Dance Central 4 at the Ubisoft press conference on the eve of the Electronic Entertainment Expo (E3) on June 4, 2012 in Los Angeles, California. E3 is the most important yearly trade show the $78.5 billion videogame industry. (Photo by David McNew/Getty Images)