20. Maroon 5 - One More Night

(Photo credit should read Ronaldo Schemidt/AFP/GettyImages)

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)

19. Usher - Scream

(Photo by Alberto E. Rodriguez/Getty Images For BET)

LOS ANGELES, CA - JUNE 29: Singer Usher attends day 1 of the 2012 BET Awards Radio Room held at The Shrine Auditorium on June 29, 2012 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images For BET)

18. Kanye West/Jay Z - In Paris

(Photo by Michael Buckner/Getty Images For BET)

LOS ANGELES, CA - JULY 01: Recording artists Kanye West (L) and Jay-Z accept the Best Group Award 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)

17. Cher Lloyd - Want You Back

(Photo by Samir Hussein/Getty Images)

CHELMSFORD, ENGLAND - AUGUST 19: Cher Lloyd performs on the Arena Stage on day 2 of the V Festival at Hylands Park on August 19, 2012 in Chelmsford, England. (Photo by Samir Hussein/Getty Images)

16. The Wanted - Glad You Came

(Photo by Mike Coppola/Getty Images)

NEW YORK, NY - AUGUST 24: (L-R) Jay McGuiness, Max George, Tom Parker, Siva Kaneswaran, and Nathan Sykes of The Wanted perform on ABC's "Good Morning America" at Rumsey Playfield, Central Park on August 24, 2012 in New York City. (Photo by Mike Coppola/Getty Images)

15. Fun. - We Are Young

(Photo by Neilson Barnard/Getty Images)

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)

14. Wiz Khalifa/Snoop Dogg - Young, Wild, & Free

(Photo by Gary Gershoff/Getty Images)

WANTAGH, NY - AUGUST 02: Rap artist Chiddy of the rap duo Chiddy Bang performs at Nikon at Jones Beach Theater on August 2, 2012 in Wantagh, New York. (Photo by Gary Gershoff/Getty Images)

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

(Photo by Brian Ach/Getty Images)

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)

12. Kirko Bangz - Drank In My Cup

(Photo by Maury Phillips/Getty Images For BET)

LOS ANGELES, CA - JULY 01: Rapper Kirko Bangz aka Kirk Randle arrives at the 2012 BET Awards at The Shrine Auditorium on July 1, 2012 in Los Angeles, California. (Photo by Maury Phillips/Getty Images For BET)

11. Nicki Minaj - Pound The Alarm

(Photo by Kevin Winter/Getty Images)

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)

10. Katy Perry - Wide Awake

(Photo by Kevin Winter/Getty Images)

HOLLYWOOD, CA - JUNE 26: Singer Katy Perry performs at the first-ever Pepsi/Billboard Summer Beats special live performance for "Katy Perry: Part Of Me" at Grauman's Chinese Theatre on June 26, 2012 in Hollywood, California. "Katy Perry: Part Of Me" will be released by Paramount's Insurge Pictures on July 5, 2012. (Photo by Kevin Winter/Getty Images)

9. Drake/Rihanna - 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)

8. Drake/Lil Wayne - The Motto

(Photo by Ronald Martinez/Getty Images)

ORLANDO, FL - FEBRUARY 26: Hip-hop artists Lil' Wayne, wearing diamond studded beats headphones by Dr. Dre 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. Kanye West - Mercy

(Photo by Michael Buckner/Getty Images For BET)

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)

6. Justin Bieber - As Long As You Love Me

(Photo by Kevin Winter/Getty Images)

5. Nicki Minaj - Starships

(Photo by Larry Busacca/Getty Images for Pepsi)

NEW YORK, NY - AUGUST 14: Nicki Minaj performs at Pepsi Presents Nicki Minaj's Pink Friday Tour at Roseland on August 14, 2012 in New York City. (Photo by Larry Busacca/Getty Images for Pepsi)

4. David Guetta/Sia - Titanium

(Photo credit should read FREDERIC LAFARGUE/AFP/GettyImages)

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)

3. Rihanna - Where Have You Been

(Photo by Danny Martindale/Getty Images)

LONDON, ENGLAND - JULY 08: Rihanna performs at Barclaycard Wireless Festival at Hyde Park on July 8, 2012 in London, England. (Photo by Danny Martindale/Getty Images)

2. 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)

1. Flo Rida - Whistle

(Photo by Kevin Winter/Getty Images for VH1)

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)