#25 Ed Sheeran - "The A Team"

LONDON, UNITED KINGDOM - JUNE 09: Ed Sheeran attends The Capital FM Summertime Ball 2012 at Wembley Stadium on June 9, 2012 in London, United Kingdom. (Photo by Stuart Wilson/Getty Images)

#24 Junior Doctor "Uh Oh"

#23 Katy Perry "Wide Awake"

TORONTO, ON - JUNE 17: Singer Katy Perry arrives at the 2012 MuchMusic Video Awards at the MuchMusic HQ on June 17, 2012 in Toronto, Canada. (Photo by Jag Gundu/Getty Images)

#22 Jessie J "Domino"

LONDON, ENGLAND - JUNE 04: Singer Jessie J performs on stage during the Diamond Jubilee concert at Buckingham Palace on June 4, 2012 in London, England. For only the second time in its history the UK celebrates the Diamond Jubilee of a monarch. Her Majesty Queen Elizabeth II celebrates the 60th anniversary of her ascension to the throne. Thousands of well-wishers from around the world have flocked to London to witness the spectacle of the weekend?s celebrations. (Photo by Dan Kitwood/Getty Images)

#21 Adele "Set Fire To The Rain"

British singer-songwriter Adele celebrates with the British Album of the Year award for her album "21" at the BRIT Awards 2012 in London on February 21, 2012. AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/Getty Images)

#20 Katy Perry "The One That Got Away"

(Photo by Michael Kovac/Getty Images for City of Hope)

#19 Train - "50 Ways To Say Goodbye"

POINT PLEASANT BEACH, NJ - MAY 25: Singer Patrick Monahan of Train performs 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)

#18 Graffiti6 "Free"

NEW YORK - OCTOBER 18: Graffiti 6 performs at Rockwood Music Hall on October 18, 2010 in New York City. (Photo by Joe Kohen/Getty Images)

#17 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)

#16 Jason Mraz "I Won't Give Up"

NEW YORK, NY - APRIL 26: Singer/songwriter Jason Mraz visits fuse's "Top 20" at fuse Studios on April 26, 2012 in New York City. (Photo by Charles Eshelman/Getty Images)

#15 Bruno Mars "It Will Rain"

NEW YORK, NY - APRIL 03: Bruno Mars performs during the 2012 Concert for the Rainforest Fund at Carnegie Hall on April 3, 2012 in New York City. (Photo by Jamie McCarthy/Getty Images)

#14 John Mayer "Shadow Days"

LAS VEGAS, NV - APRIL 30: Recording artist John Mayer performs during Tiger Jam 2011 at the Mandalay Bay Events Center April 30, 2011 in Las Vegas, Nevada. The event benefits the Tiger Woods Foundation. (Photo by Ethan Miller/Getty Images)

#13 Neon Trees "Everybody Talks"

NEW YORK, NY - APRIL 18: (L-R) Chris Allen, Elaine Bradley, Tyler Glenn, and Branden Campbell of Neon Trees visit fuse's "Hoppus on Music" at fuse Studios on April 18, 2012 in New York City. (Photo by Cindy Ord/Getty Images)

#12 Karmin "Broken Hearted"

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)

#11 Ellie Goulding "Lights"

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)

#10 Adele "Rumour Has It"

LONDON, ENGLAND - FEBRUARY 21: Adele attends The BRIT Awards 2012 at the O2 Arena on February 21, 2012 in London, England. (Photo by Gareth Cattermole/Getty Images)

#09 Christina Perri "A Thousand Years"

LOS ANGELES, CA - NOVEMBER 14: Actress Christina Perri arrives at the Premiere of Summit Entertainment's "The Twilight Saga: Breaking Dawn - Part 1" at Nokia Theatre L.A. Live on November 14, 2011 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)

#08 Katy Perry "Part Of Me"

(Photo by Michael Kovac/Getty Images for City of Hope)

#07 The Wanted "Glad You Came"

NEW YORK, NY - JUNE 14: Musicians Siva Kaneswaran, Max George, Nathan Sykes, Jay McGuiness and Tom Parker of The Wanted perform onstage at the Media Mixer industry event presented by Elvis Duran and The Morning Show at the iHeartRadio Theater on June 14, 2012 in New York City. (Photo by Andrew H. Walker/Getty Images)

#06 Maroon 5 "Payphone"

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

#05 Carly Rae Jepsen "Call Me Maybe"

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)

#04 Kelly Clarkson "Stronger (What Doesn't Kill You)"

Kelly Clarkson performs at the Staples Center during the 54th Grammy Awards in Los Angeles, California, February 12, 2012. AFP PHOTO Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

#03 Train "Drive By"

LOS ANGELES, CA - OCTOBER 15: Singer Patrick Monahan of the band 'Train' performs onstage during The First Annual Los Angeles Food & Wine Hosts "Lexus LIVE On The Plaza" with Train at LA Live on October 15, 2011 in Los Angeles, California. (Photo by John Sciulli/Getty Images for DCP)

#02 Fun. w/ Janelle Monae "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)

#01 Gotye "Somebody That I Used To Know"

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)