20. Pitbull - Back In Time

(Photo by David Becker/Getty Images)

LAS VEGAS, NV - MARCH 30: Armando 'Pitbull' Perez, winner of the BMI President's Award, performs during the 19th Annual BMI Latin Music Awards at the Encore Las Vegas on March 30, 2012 in Las Vegas, Nevada. (Photo by David Becker/Getty Images)

19. Drake/Nicki Minaj - Make Me Proud

(Photo by Ronald Martinez/Getty Images)

ORLANDO, FL - FEBRUARY 26: Recording artist Drake looks on during the 2012 NBA All-Star Game 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. (Photo by Ronald Martinez/Getty Images)

18. Jay-Z/Kanye West - In Paris

(Photo by Kevin Winter/Getty Images)

LOS ANGELES, CA - AUGUST 28: Rappers Jay-Z (L) and Kanye West perform onstage during the 2011 MTV Video Music Awards at Nokia Theatre L.A. LIVE on August 28, 2011 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)

17. B.o.B./Taylor Swift - Both Of Us

(Photo by Kevin Winter/Getty Images)

CARSON, CA - MAY 12: Singer B.o.B. performs at 102.7 KIIS FM's Wango Tango at The Home Depot Center on May 12, 2012 in Carson, California. (Photo by Kevin Winter/Getty Images)

16. Rihanna/Drake - Take Care

(Photo by Jesse D. Garrabrant/NBAE via Getty Images)

LOS ANGELES, CA - FEBRUARY 20: Singer Rihanna and Rapper Drake perform during half-time during the 2011 NBA All-Star Game on February 20, 2011 at the Staples Center in Los Angeles, California. 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 2011 NBAE (Photo by Jesse D. Garrabrant/NBAE via Getty Images)

15. Rihanna - Birthday Cake

(Photo by Jason Merritt/Getty Images)

LOS ANGELES, CA - FEBRUARY 12: Singer Rihanna arrives at the 54th Annual GRAMMY Awards held at Staples Center on February 12, 2012 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)

14. Flo Rida/Sia - Wild Ones

(Photo by Ryan Pierse/Getty Images)

MELBOURNE, AUSTRALIA - APRIL 15: Musician Flo Rida arrives at the 2012 Logie Awards at the Crown Palladium on April 15, 2012 in Melbourne, Australia. (Photo by Ryan Pierse/Getty Images)

13. Havana Brown - We Run The Night

(Photo by Alphonso Chan/Getty Images)

SINGAPORE - SEPTEMBER 26: Havana Brown performs on stage on the third and final day of the three day F1 Rocks Singapore concert at Fort Canning Park on September 26, 2009 in Singapore. (Photo by Alphonso Chan/Getty Images)

12. David Guetta/Sia - Titanium

(Photo credit should read JENS KALAENE/AFP/Getty Images)

French DJ David Guetta poses with the 2012 Echo Music Award in the category 'Club/Dance National/International' in the press room after the Echo Awards ceremony in Berlin on March 22, 2012. The German music award granted every year by the Deutsche Phono academy awards prizes in 27 categories. AFP PHOTO / JENS KALAENE - - GERMANY OUT - - (Photo credit should read JENS KALAENE/AFP/Getty Images)

11. Chris Brown - Strip

(Photo by Michael Buckner/Getty Images)

HOLLYWOOD - AUGUST 04: Singer Chris Brown arrives at the premiere of Screen Gems' "Takers" at the Arclight Cinerama Dome on August 4, 2010 in Hollywood, California. (Photo by Michael Buckner/Getty Images)

10. Wiz Khalifa - Work Hard Play Hard

UNIVERSAL CITY, CA - JUNE 03: Rapper Wiz Khalifa 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)

9. One Direction - What Makes You Beautiful

(Photo credit should read Marty Melville/AFP/GettyImages)

(FILES) A file picture taken on April 21, 2012 in Wellington shows (RtoL) Zayn Malik, Liam Payne, Niall Horan, Louis Tomlinson and Harry Styles of the British-Irish boy band One Direction performing during the group's concert at the St James theatre. One Direction to dethrone Justin Bieber in the heart of the teenagers, signs the big return of boys band, these groups invented to seduce the girls who had been all the rage in the 90's. Liam, Harry, Zayn, Niall and Louis have between 18 and 20 years, are beautiful and appropriate on them and sing some sweet pop. AFP PHOTO / MARTY MELVILLE (Photo credit should read Marty Melville/AFP/GettyImages)

8. Drake/Lil Wayne - The Motto

(Photo by Ronald Martinez/Getty Images)

ORLANDO, FL - FEBRUARY 26: Hip-hop artists Lil' Wayne and Drake (L) sit courtside during the 2012 NBA All-Star Game 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. (Photo by Ronald Martinez/Getty Images)

7. Fun. - We Are Young

(Photo by Charles Eshelman/Getty Images for Spotify)

NEW YORK, NY - NOVEMBER 30: (L-R) Andrew Dost, Nate Ruess and Jack Antonoff of the band Fun attend Spotify knocks it out of the park at Stephen Weiss Studio on November 30, 2011 in New York City. (Photo by Charles Eshelman/Getty Images for Spotify)

6. Kirko Bangz - Drank In My Cup

5. Nicki Minaj - Starships

(Photo by Danny Martindale/Getty Images)

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)

4. Gotye - Somebody That I Used To Know

(Photo by Michael Buckner/Getty Images for Coachella)

INDIO, CA - APRIL 15: 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. Maroon 5 - Payphone

(Photo by Tasos Katopodis/Getty Images for Caesars Entertainment)

CHICAGO, IL - MARCH 01: Adam Levine and James valentine of Maroon 5 perform at Escape To Total Rewards at Union Station on March 1, 2012 in Chicago, Illinois. (Photo by Tasos Katopodis/Getty Images for Caesars Entertainment)

2. Carly Rae Jepsen - Call Me Maybe

(Photo by Stuart Wilson/Getty Images)

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)

1. Rihanna - Where Have You Been

(Photo by John Shearer/Getty Images for Entertainment Industry Foundation)

BEVERLY HILLS, CA - APRIL 18: Singer Rihanna performs onstage at the 15th Annual "An Unforgettable Evening" Benefiting EIF's Women's Cancer Research Fund held at The Beverly Hilton Hotel on April 18, 2012 in Beverly Hills, California. (Photo by John Shearer/Getty Images for Entertainment Industry Foundation)