#20: John Mayer "Shadow Days"
AFP PHOTO / Robyn Beck (Photo credit should read ROBYN BECK/AFP/Getty Images)Photo Source Getty Images
#19: Bruno Mars "Grenade"
LAS VEGAS, NV - FEBRUARY 16: Singer Bruno Mars performs onstage at Club SI Swimsuit hosted by the Pure Nightclub at Caesars Palace at the Pure Nightclub at Caesars Palace on February 16, 2012 in Las Vegas, Nevada. (Photo by Michael Loccisano/Getty Images for Sports Illustrated)
#18: Adele "Someone Like You"
British singer-songwriter Adele poses on the red carpet arriving at the BRIT Awards 2012 in London on February 21, 2012. AFP PHOTO / BEN STANSALL (Photo credit should read BEN STANSALL/AFP/Getty Images)(Photo credit BEN STANSALL/AFP/Getty Images)
#17: Snow Patrol "Called Out In The Dark"
MANCHESTER, ENGLAND - NOVEMBER 17: L-R Nathan Connolly, Jonny Quinn, Gary Lightbody, Tom Simpson and Paul Wilson of Snow Patrol pose backstage at Children In Need Rocks Manchester 2011 at The Manchester Evening News Arena on November 17, 2011 in Manchester, United Kingdom. (Photo by Dave J Hogan/Getty Images)
#16: Gotye "Someboday That I Used To Know"
SYDNEY, AUSTRALIA - NOVEMBER 27: Wally De Backer poses with the award for Male Artist of the Year at the 2011 ARIA Awards at Allphones Arena on November 27, 2011 in Sydney, Australia. (Photo by Mark Metcalfe/Getty Images)
#15: The Script "If You Ever Come Back"
NEW YORK, NY - DECEMBER 09: (L-R) Glen Power, Danny O'Donoghue and Mark Sheehan of The Script attend Z100's Jingle Ball 2011, presented by Aeropostale Madison Square Garden on December 9, 2011 in New York City. (Photo by Michael Loccisano/Getty Images)
#14: Katy Perry "Part Of Me"
LOS ANGELES, CA - FEBRUARY 26: Singer Katy Perry arrives at the 20th Annual Elton John AIDS Foundation's Oscar Viewing Party held at West Hollywood Park on February 26, 2012 in West Hollywood, California. (Photo by Frederick M. Brown/Getty Images)
#13: Hot Chelle Rae "I Like It Like That"
NEW YORK, NY - DECEMBER 09: Singer Ryan Follese of Hot Chelle Rae performs onstage during Z100's Jingle Ball 2011, presented by Aeropostale at Madison Square Garden on December 9, 2011 in New York City. (Photo by Stephen Lovekin/Getty Images)
#12: Matt Nathanson ft. Sugarland "Run"
NAPA, CA - APRIL 10: Matt Nathanson performs at the Uptown Theatre as part of Aloft Hotels Presents Live in the Vineyard on April 10, 2011 in Napa, California. (Photo by Tim Mosenfelder/Getty Images For Live In The Vineyard LLC)
#11: 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 Kevin Winter/Getty Images)
#10: Jason Mraz "I Won't Give Up"
LOS ANGELES, CA - FEBRUARY 10: Singer Jason Mraz arrives at the 2012 MusiCares Person of the Year Tribute to Paul McCartney held at the Los Angeles Convention Center on February 10, 2012 in Los Angeles, California. (Photo by Larry Busacca/Getty Images For The Recording Academy)
#9: Jessie J "Domino"
LONDON, ENGLAND - FEBRUARY 21: Jessie J attends The BRIT Awards 2012 at the O2 Arena on February 21, 2012 in London, England. (Photo by Gareth Cattermole/Getty Images)
#8: Coldplay "Paradise"
LOS ANGELES, CA - FEBRUARY 12: Musician Chris Martin of Coldplay performs onstage at the 54th Annual GRAMMY Awards held at Staples Center on February 12, 2012 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)
#7: Foster The People "Don't Stop"
BEVERLY HILLS, CA - FEBRUARY 26: Musicians Cubbie Fink, Mark Foster and Mark Pontius of musical group Foster The People arrive at the 20th Annual Elton John AIDS Foundation Academy Awards Viewing Party at The City of West Hollywood Park on February 26, 2012 in Beverly Hills, California. (Photo by Larry Busacca/Getty Images for EJAF)
#6: Florence + The Machine "Shake It Out"
Florence Welch from British indie band Florence and the Machine poses on the red carpet arriving at the BRIT Awards 2012 in London on February 21, 2012. AFP PHOTO / BEN STANSALL (Photo credit should read BEN STANSALL/AFP/Getty Images)
#5: Adele "Set Fire To The Rain"
British singer-songwriter Adele accepts the British Female Solo Artist award at the BRIT Awards 2012 in London on February 21, 2012. AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/Getty Images)
#4: Gym Class Heroes ft. Adam Levine "Stereo Hearts"
INDIANAPOLIS, IN - FEBRUARY 04: Singer Travie McCoy of the Gym Class Heroes arrives at Rolling Stone's Bacardi Bash: 150 Years of Rocking The Party at The Crane Bay on February 4, 2012 in Indianapolis, Indiana. (Photo by Gustavo Caballero/Getty Images for Rolling Stone's Volkswagen Rock & Roll Tailgate)
#3: Train "Drive By"
LAS VEGAS, NV - MARCH 10: Singer Pat Monahan performs during the opening night of The Smith Center for the Performing Arts on March 10, 2012 in Las Vegas, Nevada. (Photo by Bryan Steffy/Getty Images for The Smith Center)
#2: Kelly Clarkson "Stronger"
LOS ANGELES, CA - NOVEMBER 20: Singer Kelly Clarkson performs onstage at the 2011 American Music Awards held at Nokia Theatre L.A. LIVE on November 20, 2011 in Los Angeles, California. (Photo by Kevork Djansezian/Getty Images)
#1: Katy Perry "The One That Got Away"
GLENDALE, CA - FEBRUARY 22: Katy Perry attends the Katy Perry Lashes created by Eylure Launch Event at The Americana at Brand on February 22, 2012 in Glendale, California. (Photo by Michael Kovac/Getty Images for Eylure)