102 JAMZ Top 20 Countdown20. Ke$ha - C'monLOS ANGELES, CA - NOVEMBER 18: Singer Kesha attends the 40th American Music Awards held at Nokia Theatre L.A. Live on November 18, 2012 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)
102 JAMZ Top 20 Countdown19. Calvin Harris featuring Ne-Yo - Let's GoHOLMDEL, 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)
102 JAMZ Top 20 Countdown18. Alex Clare - Too CloseFestival 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)
102 JAMZ Top 20 Countdown17. Pitbull - Don't Stop The Party<> on August 9, 2012 in Los Angeles, California.
102 JAMZ Top 20 Countdown16. Calvin Harris featuring Florence Welch - Sweet NothingLOS 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)
102 JAMZ Top 20 Countdown15. Will.I.Am/ Britney Spears - Scream & Shoutat 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.
102 JAMZ Top 20 Countdown14. Chris Brown - Don't Wake Me UpLOS ANGELES, CA - SEPTEMBER 06: Singer Chris Brown accepts the award for Best Male Video onstage during the 2012 MTV Video Music Awards at Staples Center on September 6, 2012 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)
102 JAMZ Top 20 Countdown13. Trey Songz - Heart AttackATLANTA, GA - AUGUST 26: Trey Songz attends Heineken Red Star Access Atlanta featuring Trey Songz, Kendrick Lamar and DJ MLK hosted by Affion Crockett at Opera Nightclub on August 26, 2012 in Atlanta, Georgia. (Photo by Moses Robinson/Getty Images for Heineken)
102 JAMZ Top 20 Countdown12. Alicia Keys featuring Nicki Minaj - Girl On FireAlicia Keys performs onstage at iHeartRadio Live Presents Alicia Keys at iHeartRadio Theater on November 27, 2012 in New York City.
102 JAMZ Top 20 Countdown11. Fun. - Some Nightsattends the 2012 Do Something Awards at Barker Hangar on August 19, 2012 in Santa Monica, California.
102 JAMZ Top 20 Countdown10. Pink - Tryattends 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.
102 JAMZ Top 20 Countdown9. Ke$ha - Die Youngarrives at the 2012 MTV Video Music Awards at Staples Center on September 6, 2012 in Los Angeles, California.
102 JAMZ Top 20 Countdown8. Justin Bieber featuring Nicki Minaj - Beauty And A Beatat The Staples Center on October 2, 2012 in Los Angeles, California.
102 JAMZ Top 20 Countdown7. Swedish House Mafia - Don't You Worry ChildNEW YORK, NY - DECEMBER 16: (FOR EDITORIAL USE ONLY) DJ's Axwell, Steve Angello and Sebastian Ingrosso of Swedish House Mafia perform at Madison Square Garden on December 16, 2011 in New York City. (Photo by Michael Loccisano/Getty Images)(Photo by Michael Loccisano/Getty Images)
102 JAMZ Top 20 Countdown6. Nicki Minaj - Va Va VoomSYDNEY, AUSTRALIA - NOVEMBER 29: Nicki Minaj presents the ARIA for best Urban release on stage at the 26th Annual ARIA Awards 2012 at the Sydney Entertainment Centre on November 29, 2012 in Sydney, Australia. (Photo by Don Arnold/Getty Images)
102 JAMZ Top 20 Countdown5. Flo Rida - I CryPASADENA, CA - SEPTEMBER 16: Rapper Flo Rida performs onstage at the 2012 NCLR ALMA Awards at Pasadena Civic Auditorium on September 16, 2012 in Pasadena, California. (Photo by Jesse Grant/Getty Images for NCLR)
102 JAMZ Top 20 Countdown4. Maroon 5 - One More NightXXX performs during the 2012 F1 Singapore on September 22, 2012 in Singapore.
102 JAMZ Top 20 Countdown3. Bruno Mars - Locked Out Of Heavenperforms onstage at the 54th Annual GRAMMY Awards held at Staples Center on February 12, 2012 in Los Angeles, California.
102 JAMZ Top 20 Countdown2. Ne-Yo - Let Me Love YouNe-Yo poses on arrival on the red carpet for the MTV Video Music Awards in Los Angeles on September 6, 2012 in California. AFP PHOTO / Frederic J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/GettyImages)
102 JAMZ Top 20 Countdown1. Rihanna - DiamondsSinger Rihanna performs live on stage as part of her 777 tour at The Forum on November 19, 2012 in London, England.