#20 T-Pain - 5 O'Clock feat. Wiz Khalifa & Lily Allen

T-Pain poses with his award during the 52nd annual Grammy Awards in Los Angeles, California on January 31, 2010. AFP PHOTO / VALERIE MACON (Photo credit should read VALERIE MACON/AFP/Getty Images)

#19 Adele - Someone Like You

performs onstage during the 2011 MTV Video Music Awards at Nokia Theatre L.A. LIVE on August 28, 2011 in Los Angeles, California.

#18 Adele - Set Fire To the Rain

LONDON, ENGLAND - SEPTEMBER 06: (UK TABLOID NEWSPAPERS OUT) poses in front of the winners board at the Barclaycard Mercury Prize 2011 at Grosvenor House on September 6, 2011 in London, United Kingdom. (Photo by Dave Hogan/Getty Images)

#17 Big Sean - Dance (A$$)

LOS ANGELES, CA - JUNE 26: Singer Big Sean performs onstage during the BET Awards '11 held at the Shrine Auditorium on June 26, 2011 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)

#16 Drake - Headlines

LAS VEGAS, NV - JANUARY 01: Recording artist Drake performs at The Joint inside the Hard Rock Hotel & Casino January 1, 2012 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)

#15 Cobra Starship - You Make Me Feel... feat. Sabi

LOS ANGELES, CA - AUGUST 28: (L-R) Musicians Alex Suarez, Nate Novarro, Ryland Blackinton, Victoria Asher and Gabe Saporta of the band Cobra Starship arrive at the 2011 MTV Video Music Awards at Nokia Theatre L.A. LIVE on August 28, 2011 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)

#14 The Wanted - Glad You Came

English/Irish boy band The Wanted In Studio at 92.3 NOW in NYC. Photo: Joe Cingrana for CBS Radio / 92.3 NOW

#13 Maroon 5 & Christina Aguilera - Moves Like Jagger

LOS ANGELES, CA - JULY 08: Musician Adam Levine of the band Maroon 5 and singer Christina Aguilera perform at the Maroon 5 Video Shoot for "Moves Like Jagger" with Christina Aguilera on July 8, 2011 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for A&M/Octone)

#12 Pitbull - International Love feat. Chris Brown

NEW YORK, NY - DECEMBER 31: Recording artist Pitbull attends New Year's Eve 2012 in Times Square on December 31, 2011 in New York City. (Photo by Neilson Barnard/Getty Images)

#11 Drake - Take Care feat. Rihanna

NEW YORK, NY - DECEMBER 31: Rapper Drake performs on stage during New Year's Eve 2012 With Carson Daly in Times Square on December 31, 2011 in New York City. (Photo by Neilson Barnard/Getty Images)

#10 Rihanna - You Da One

MADRID, SPAIN - DECEMBER 15: Singer Rihanna performs on stage at the Palacio de los Deportes stadium on December 15, 2011 in Madrid, Spain. (Photo by Carlos Alvarez/Getty Images)

#9 Gym Class Heroes - Stereo Hearts feat. Adam Levine

NEW YORK - SEPTEMBER 23: (L-R) Disashi Lumumba-Kasongo, Tyler Pursel, Travis McCoy, Matt McGinley and Eric Roberts of Gym Class Heroes attend the 2009 VH1 Hip Hop Honors at the Brooklyn Academy of Music on September 23, 2009 in the Brooklyn borough of New York City. (Photo by Larry Busacca/Getty Images)

#8 David Guetta - Without You feat. Usher

French DJ David Guetta (top C) perofrms on stage during the MTV European Music Awards (EMA) at the Odyssey Arena in Belfast, Northern Ireland, on November 6, 2011. AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/Getty Images)

#7 Katy Perry - The One That Got Away

attends Katy Perry launches MEOW! by Katy Perry available exclusively at Nordstrom held at The Grove on December 14, 2011 in Los Angeles, California.

#6 Bruno Mars - It Will Rain

Singer Bruno Mars poses at the Grammy Nominations Concert in Los Angeles on November 30, 2011. AFP PHOTO/VALERIE MACON (Photo credit should read VALERIE MACON/AFP/Getty Images)

#5 Jay-Z & Kanye West - Paris

NEW YORK, NY - NOVEMBER 09: Kanye West (L) and Jay-Z perform during the 2011 Victoria's Secret Fashion Show at the Lexington Avenue Armory on November 9, 2011 in New York City. (Photo by Jamie McCarthy/Getty Images)

#4 J. Cole - Workout

NEW YORK, NY - MAY 17: Rapper J. Cole attends the 2011 BET Awards nominees announcement at BET Studios on May 17, 2011 in New York City. (Photo by Cindy Ord/Getty Images)

#3 Flo Rida - Good Feeling

LOS ANGELES, CA - AUGUST 28: Recording artist Flo Rida attends Cash Money Records' Lil Wayne album release party for "Tha Carter IV" at Boulevard3 on August 28, 2011 in Los Angeles, California. (Photo by David Livingston/Getty Images)

#2 Rihanna - We Found Love feat. Calvin Harris

NEW YORK, NY - MAY 27: Singer Rihanna performs on NBC's "Today" in Rockefeller Plaza on May 27, 2011 in New York City. (Photo by Mike Coppola/Getty Images)

#1 LMFAO - Sexy & I Know It

Photo by Kevork Djansezian/Getty Images

LOS ANGELES, CA - NOVEMBER 20: Singers SkyBlu and Redfoo of LMFAO 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)