LOS ANGELES, CA - NOVEMBER 21: Singer Pink arrives at the 2010 American Music Awards held at Nokia Theatre L.A. Live on November 21, 2010 in Los Angeles, California. (Photo by Jason Merritt/Getty Images for DCP)
#19 Demi Lovato - Give Your Heart A Break
PABLO PORCIUNCULA/AFP/GettyImages
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)
#18 One Direction - What Makes You Beautiful
Photo by Neilson Barnard/Getty Images
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)
#17 Chris Brown - Don't Wake Me Up
Photo by Michael Buckner/Getty Images For BET
LOS ANGELES, CA - JULY 01: Singer Chris Brown performs 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)
#16 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)
#15 Justin Bieber - As Long As You Love Me
Photo by Jag Gundu/Getty Images
TORONTO, ON - JUNE 17: Justin Bieber arrives at the 2012 MuchMusic Video Awards at MuchMusic HQ on June 17, 2012 in Toronto, Canada. (Photo by Jag Gundu/Getty Images)
#14 Cher Lloyd - What U Back
Photo by Gareth Cattermole/Getty Images
LONDON, ENGLAND - NOVEMBER 02: Cher Lloyd arrives for the 'Cosmopolitan Ultimate Women Of The Year Awards 2010' at Banqueting House on November 2, 2010 in London, England. (Photo by Gareth Cattermole/Getty Images)
#13 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)
#12 Flo Rida - Whistle
Photo by Mike Coppola/Getty Images
NEW YORK, NY - JULY 06: Rapper/singer Flo Rida performs on NBC's "Today" at Rockefeller Plaza on July 6, 2012 in New York City. (Photo by Mike Coppola/Getty Images)
#11 David Guetta - Titanium ft. Sia
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)
#10 Havana Brown - We Run The Night ft. Pitbull
Photo by Lisa Maree Williams/Getty Images
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)
#9 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)
#8 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)
#7 Usher - Scream
Photo by Michael Buckner/Getty Images For BET
LOS ANGELES, CA - JULY 01: Recording Artist Usher performs 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 Nicki Minaj - Starships
Photo by Danny Martindale/Getty Images
LONDON, ENGLAND - JULY 07: Nicki Minaj performs at Barclaycard Wireless Festival at Hyde Park on July 7, 2012 in London, England. (Photo by Danny Martindale/Getty Images)
#5 Gotye - Somebody That I Used To Know
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)
#4 Katy Perry - Wide Awake
ROBYN BECK/AFP/GettyImages
Singer Katy Perry performs on Hollywood Boulevard before the premiere of her film "Katy Perry: Part Of Me" at Grauman's Chinese Theatre in Hollywood, California, on June 26, 2012. AFP PHOTO / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/GettyImages)
#3 Carly Rae Jepsen - Call Me Maybe
Photo by Jag Gundu/Getty Images
TORONTO, ON - JUNE 17: Carly Rae Jepsen arrives at the 2012 MuchMusic Video Awards at MuchMusic HQ on June 17, 2012 in Toronto, Canada. (Photo by Jag Gundu/Getty Images)
#2 Maroon 5 - Payphone ft. Wiz Khalifa
Photo by Michael Loccisano/Getty Images
NEW YORK, NY - JUNE 29: Singer Adam Levine of Maroon 5 performs on NBC's "Today" at Rockefeller Plaza on June 29, 2012 in New York City. (Photo by Michael Loccisano/Getty Images)
#1 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)
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