20. Calvin Harris - Feel So Close
HOLMDEL, NJ - MAY 20: DJ Calvin Harris spins 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)
19. Jason Derulo - The Otherside
LAS VEGAS, NV - MAY 19: Singer Jason Derulo arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by David Becker/Getty Images)
18. Mariah Carey & Miguel - #beautiful
attends the FOX "American Idol" finalists party at The Grove on March 7, 2013 in Los Angeles, California.
17. Will.I.Am & Britney Spears - Scream And Shout
at a taping of We Will Always Love You: A GRAMMY Salute To Whitney Houston on October 11, 2012 at the Nokia Theatre L.A. LIVE in Los Angeles, California. The show airs November 16, 2012.
16. Justin Timberlake - Suit & Tie
FRIEDRICHSHAFEN, GERMANY - FEBRUARY 23: Justin Timberlake attends 'Wetten dass..?' from Friedrichshafen on February 23, 2013 in Friedrichshafen, Germany. (Photo by Dominik Bindl/Getty Images)
15. Krewella - Alive
Festival goers enjoy a set by a dubstep DJ at the "Lounge on the Farm" festival near Canterbury in Kent, on July 8, 2011. Five years ago, dubstep was just another fresh but obscure strain of dance music, limited almost exclusively to a handful of nightclubs in south London. Today it is taking over dancefloors worldwide. Born out of drum'n'bass and the 2-step UK garage movement which propelled Craig David to fame, dubstep completed its journey from quirky curiosity to commercial success story earlier this month (eds: earlier in July) when DJ Fresh's "Louder" hit the top of the UK singles chart. AFP PHOTO/Leon Neal TO GO WITH AFP STORY BY JAMES PHEBY *BRITAIN-ENT-MUSIC-DUBSTEP* (Photo credit should read LEON NEAL/AFP/Getty Images)
14. Pitbull & Christina Aguilera - Feel This Moment
<> on August 9, 2012 in Los Angeles, California.
13. Calvin Harris & Florence Welch - Sweet Nothing
LOS ANGELES, CA - SEPTEMBER 06: DJ Calvin Harris poses in the press room during the 2012 MTV Video Music Awards at Staples Center on September 6, 2012 in Los Angeles, California. (Photo by Frederick M. Brown/Getty Images)
12. Daft Punk - Get Lucky
LOS ANGELES, CA - DECEMBER 11: Musicians Thomas Bangalter and Guy-Manuel De Homem-Christo of Daft Punk arrives at Walt Disney's "TRON: Legacy" World Premiere held at the El Capitan Theatre on December 11, 2010 in Los Angeles, California. (Photo by John Sciulli/Getty Images)
11. Macklemore & Ryan Lewis - Thrift Shop
CULVER CITY, CA - APRIL 14: Rapper Macklemore performs onstage during the 2013 MTV Movie Awards at Sony Pictures Studios on April 14, 2013 in Culver City, California. (Photo by Kevork Djansezian/Getty Images)
10. Ariana Grande & Mac Miller - The Way
LAS VEGAS, NV - MAY 19: Actress/singer Ariana Grande arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)
9. Selena Gomez - Come & Get It
LAS VEGAS, NV - MAY 19: Actress Selena Gomez arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)
8. Justin Bieber & Will.I.Am - #thatpower
at The Staples Center on October 2, 2012 in Los Angeles, California.
7. Fall Out Boy - My Songs Know What You Did In The Dark
NEW YORK, NY - APRIL 12: (L-R) Drummer Andy Hurley, bassist Pete Wentz, vocalist/guitarist Patrick Stump and guitarist Joe Trohman of Fall Out Boy pose backstage after performing at iHeartRadio Theater on April 12, 2013 in New York City. (Photo by Stephen Lovekin/Getty Images for iHeartRadio)
6. Demi Lovato - Heart Attack
LOS ANGELES, CA - FEBRUARY 13: Singer Demi Lovato arrives at the Topshop Topman LA Opening Party at Cecconi's West Hollywood on February 13, 2013 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)
5. Rihanna - Stay
Singer Rihanna performs live on stage as part of her 777 tour at The Forum on November 19, 2012 in London, England.
4. Icona Pop - I Love It
LAS VEGAS, NV - MAY 19: Singers Caroline Hjelt (L) and Aino Jawo of Icona Pop arrive at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)
3. Macklemore & Ryan Lewis - Can't Hold Us
Macklemore and Ryan Lewis perform live at Nova's Red Room at The Cullen Hotel on February 13, 2013 in Melbourne, Australia.
2. P!nk - Just Give Me A Reason
attends the St. John's Health Center's Power Of Pink benefiting The Margie Petersen Breast Center at Sony Studios on November 12, 2012 in Los Angeles, California.
1. Justin Timberlake - Mirrors
NEW YORK, NY - APRIL 23: Justin Timberlake attends the 2013 Time 100 Gala at Frederick P. Rose Hall, Jazz at Lincoln Center on April 23, 2013 in New York City. (Photo by Jamie McCarthy/Getty Images)