25. 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)

24. Chiddy Bang – Mind Your Manners

CARSON, CA - MAY 12: Singer Chidera "Chiddy Bang" Anamege 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)

23. David Guetta - Titanium

HOLLYWOOD, CA - APRIL 18: Two time Grammy Award Winner, singer, songwriter David Guetta arrives at the 2012 ASCAP POP Music Awards at the Hollywood Renaissance Hotel on April 18, 2012 in Hollywood, California. (Photo by John M. Heller/Getty Images)

22. Drake – The Motto

IRVINE, CA - MAY 08: Singer Drake performs at The Verizon Wireless Amphitheatre on May 8, 2012 in Irvine, California. (Photo by Kevin Winter/Getty Images)

21. Gym Class Heros – The Fighter

CARSON, CA - MAY 12: Singer Travie McCoy of Gym Class Heroes 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)

20. 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)

19. One Direction – One Thing

NEW YORK, NY - MAY 26: 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. Rita Ora – How We Do

LONDON, UNITED KINGDOM - MAY 28: Rita Ora attends the London audition of X-Factor at on May 28, 2012 in London, England. (Photo by Neil Mockford/Getty Images)

17. Havanna Brown – We Run The Night

16. Pitbull ft. Chris Brown – International Love

NEW YORK, NY - MAY 23: Pitbull attends the "Men In Black 3" New York Premiere at Ziegfeld Theatre on May 23, 2012 in New York City. (Photo by Stephen Lovekin/Getty Images)

15. Gavin DeGraw – Not Over You

LAS VEGAS, NV - MAY 20: Singer Gavin Degraw 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)

14. Fun. – We Are Young

UNIVERSAL CITY, CA - JUNE 03: Musical group 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)

13. Demi Lovato – Give Your Heart a Break

US singer Demi Lovato performs under heavy rain in Montevideo during her A Special Night tour on April 29, 2012. AFP PHOTO/Pablo PORCIUNCULA (Photo credit should read PABLO PORCIUNCULA/AFP/GettyImages)

12. The Wanted – Glad You Came

LAS VEGAS, NV - MAY 20: (L-R) Nathan Sykes, Jay McGuiness, Siva Kaneswaran, Tom Parker and Max George of The Wanted arrive 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. Usher - Scream

LOS ANGELES, CA - JUNE 04: Usher perfroms as the game Dance Central 3 is introduced during the Microsoft Xbox press conference at the Electronic Entertainment Expo at the Galen Center on June 4, 2012 in Los Angeles, California. Thousands are expected to attend the annual three-day convention to see the latest games and announcements from the gaming industry. (Photo by Kevork Djansezian/Getty Images)

9. One Direction –What Makes You Beautiful

NEW YORK, NY - MAY 26: Louis Tomlinson of British boy band One Direction performs live on stage at the Beacon Theatre on May 26, 2012 in New York City. (Photo by Neilson Barnard/Getty Images)

8. Katy Perry – Wide Awake

LAS VEGAS, NV - MAY 20: Singer Katy Perry 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)

7. Maroon 5 - Payphone

BALTIMORE, MD - MAY 19: Maroon 5 lead vocalist and guitarist Adam Levine perform prior to the 137th running of the Preakness Stakes at Pimlico Race Course on May 19, 2012 in Baltimore, Maryland. (Photo by Patrick Smith/Getty Images)

6. Flo Rida – Wild Ones

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)

5. Taylor Swift – Eyes Open

LAS VEGAS, NV - MAY 20: Singer Taylor Swift 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)

4. Gotye – Somebody I Used To Know

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)

3. Nicki Minaj – Starships

CARSON, CA - MAY 12: Singer Nicki Minaj 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)

2. Train – Drive By

POINT PLEASANT BEACH, NJ - MAY 25: Singer Patrick Monahan of Train thanks fans during the 15th Annual WPLJ Summer Blast-Off at Jenkinsons On The Boardwalk on May 25, 2012 in Point Pleasant Beach, New Jersey. (Photo by Michael Loccisano/Getty Images)

1. Carly Rae Jepsen – Call Me Maybe

LAS VEGAS, NV - MAY 20: Singer Carly Rae Jepsen 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)