LOS ANGELES, CA - FEBRUARY 12: Singer Adele performs onstage at the 54th Annual GRAMMY Awards held at Staples Center on February 12, 2012 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)
#18 Pitbull - Back In Time
Photo by Stephen Lovekin/Getty Images
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)
#17 Justin Bieber - Boyfriend
Photo by Vittorio Zunino Celotto/Getty Images
MILAN, ITALY - JUNE 02: Justin Bieber performs at Alcatraz on June 2, 2012 in Milan, Italy. (Photo by Vittorio Zunino Celotto/Getty Images)
#16 Karmin - Broken Hearted
Photo by Brian Ach/Getty Images
HOLMDEL, NJ - MAY 20: Amy Heidemann of Karmin performs 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)
#15 Ellie Goulding - Lights
Photo by Michael Buckner/Getty Images
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 Katy Perry - Wide Awake
Photo by Jason Merritt/Getty Images
CENTURY CITY, CA - MAY 10: Singer Katy Perry arrives at 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)
#13 Calvin Harris - Let's Go ft. Ne-yo
Photo by Gareth Cattermole/Getty Images
CHELMSFORD, ENGLAND - AUGUST 22: Calvin Harris performs during Day two of V Festival 2010 on August 22, 2010 in Chelmsford, England. (Photo by Gareth Cattermole/Getty Images)
#12 David Guetta - Titanium ft. Sia
Photo by Jason Merritt/Getty Images
LOS ANGELES, CA - FEBRUARY 12: DJ David Guetta performs onstage at the 54th Annual GRAMMY Awards held at Staples Center on February 12, 2012 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)
#11 The Wanted - Chasing The Sun
Photo by Christopher Polk/Getty Images for Planet Dailies
LOS ANGELES, CA - APRIL 26: Members of the band The Wanted; (L-R) Nathan Sykes, Max George, Siva Kaneswaran, Tom Parker and Jay McGuiness attend British Pop Sensation The Wanted Take Over Planet Dailies at Planet Dailies & Mixology 101 on April 26, 2012 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for Planet Dailies)
#10 One Direction - What Makes You Beautiful
Photo by Stephen Lovekin/Getty Images
NEW YORK, NY - MAY 23: (Left to right) Singers Zayn Malik, Harry Styles, Liam Payne, Louis Tomlinson, and Niall Horan of One Direction attend 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)
#9 Havana Brown - We Run The Night ft. Pitbull
Photo by Frederick M. Brown/Getty Images
HOLLYWOOD, CA - JUNE 07: Actress Havana Brown attends The (RED) RUSH Games Party at Avalon Hollywood on June 7, 2012 in Hollywood, California. (Photo by Frederick M. Brown/Getty Images)
#8 Fun. - We Are Young ft. Janelle Monae
Photo by Max Morse/Getty Images for GLAAD
SAN FRANCISCO, CA - JUNE 02: Jack Antonoff, Nate Ruess and Andrew Dost (L to R) of the band Fun. pose backstage during the 23rd Annual GLAAD Media Awards at San Francisco Marriott Marquis on June 2, 2012 in San Francisco, California. (Photo by Max Morse/Getty Images for GLAAD)
#7 Usher - Scream
Photo by Ethan Miller/Getty Images
LAS VEGAS, NV - NOVEMBER 10: Singer Usher arrives at the 12th annual Latin GRAMMY Awards at the Mandalay Bay Resort & Casino on November 10, 2011 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)
#6 Flo Rida - Wild Ones ft. Sia
Photo by Frederick M. Brown/Getty Images
SANTA MONICA, CA - FEBRUARY 18: Recording artist Flo Rida performs during the 2nd Annual Cartoon Network Hall of Game Awards at the Barker Hangar, Santa Monica Airport on February 18, 2012 in Santa Monica, California. (Photo by Frederick M. Brown/Getty Images)
#5 Nicki Minaj - Starships
Photo by Kevork Djansezian/Getty Images
LOS ANGELES, CA - NOVEMBER 20: Singer Nicki Minaj performs onstage at the 2011 American Music Awards held at Nokia Theatre L.A. LIVE on November 20, 2011 in Los Angeles, California. (Photo by Kevork Djansezian/Getty Images)
#4 Maroon 5 - Payphone ft. Wiz Khalifa
Photo by Jerod Harris/Getty Images for T-Mobile
LOS ANGELES, CA - NOVEMBER 16: Musicians James Valentine, Mickey Madden, Adam Levine, Jesse Carmichael, and Matt Flynn of Maroon 5 arrive on the T-Mobile magenta carpet for the launch of Google Music hosted by T-Mobile at Mr. Brainwash Studio on November 16, 2011 in Los Angeles, California. (Photo by Jerod Harris/Getty Images for T-Mobile)
#3 Carly Rae Jepsen
Photo by Frazer Harrison/Getty Images for ABC
LAS VEGAS, NV - MAY 20: Performer Carly Rae Jepsen poses in the press room 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)
#2 Gotye - Somebody That I Used To Know ft. Kimbra
Photo by Brendon Thorne/Getty Images
SYDNEY, AUSTRALIA - MAY 28: Wally De Backer arrives at the 2012 APRA Music Awards at the Sydney Convention & Exhibition Centre on May 28, 2012 in Sydney, Australia. (Photo by Brendon Thorne/Getty Images)
#1 Rihanna - Where Have You Been
Photo by Frazer Harrison/Getty Images
LOS ANGELES, CA - MAY 10: Actress/singer Rihanna arrives at the Premiere Of Universal Pictures' "Battleship" at The Nokia Theatre L.A. Live on May 10, 2012 in Los Angeles, California. (Photo by Frazer Harrison/Getty Images)
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