102 JAMZ Top 20 Countdown1. 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 Countdown2. Justin Bieber - As Long As You Love MeLAS VEGAS, NV - SEPTEMBER 30: Singer Justin Bieber performs at the MGM Grand Garden Arena as he tours in support of his new album, "Believe" on September 30, 2012 in Las Vegas, Nevada. (Photo by Bryan Steffy/Getty Images)
102 JAMZ Top 20 Countdown3. Maroon 5 - One More NightUS music group Maroon 5 members (L-R) Matt Flynn, PJ Morton, Adam Levine, Mickey Madden and James Valentine pose for a picture during a press conference in Mexico City, on August 16, 2012. Maroon 5 is in Mexico for a series of concerts. AFP PHOTO/RONALDO SCHEMIDT (Photo credit should read Ronaldo Schemidt/AFP/GettyImages)
102 JAMZ Top 20 Countdown4. 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 Countdown5. Nicki Minaj - Va Va VoomSYDNEY, AUSTRALIA - NOVEMBER 29: Nicki Minaj presents the ARIA for best Urban release at the 26th Annual ARIA Awards 2012 at the Sydney Entertainment Centre on November 29, 2012 in Sydney, Australia. (Photo by Brendon Thorne/Getty Images)
102 JAMZ Top 20 Countdown6. 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 Countdown7. Rihanna - DiamondsSinger Rihanna performs live on stage as part of her 777 tour at The Forum on November 19, 2012 in London, England.
102 JAMZ Top 20 Countdown8. Enrique Iglesias featuring Sammy Adams - Finally Found youLAS VEGAS, NV - SEPTEMBER 22: Recording artist Sammy Adams (L) and singer Enrique Iglesias perform onstage during the 2012 iHeartRadio Music Festival at the MGM Grand Garden Arena on September 22, 2012 in Las Vegas, Nevada. (Photo by Christopher Polk/Getty Images for Clear Channel)
102 JAMZ Top 20 Countdown9. Flo Rida - I CrySANTA MONICA, CA - AUGUST 19: Flo Rida performs onstage during the 2012 Do Something Awards at Barker Hangar on August 19, 2012 in Santa Monica, California. (Photo by Kevin Winter/Getty Images for VH1)
102 JAMZ Top 20 Countdown10. Justin Bieber featuring Nicki Minaj - Beauty And A BeatLOS ANGELES, CA - JUNE 26: Rapper Nicki Minaj (L) and singer Justin Bieber speak 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)
102 JAMZ Top 20 Countdown11. 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 Countdown12. 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 Countdown13. David Guetta featuring Sia - TitaniumFrench DJ David Guetta performs at the Arena in Treptow, Berlin, on July 8, 2012. AFP PHOTO / FREDERIC LAFARGUE (Photo credit should read FREDERIC LAFARGUE/AFP/GettyImages)
102 JAMZ Top 20 Countdown14. Ellie Goulding - Anything Could HappenHOLLYWOOD, 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)
102 JAMZ Top 20 Countdown15. Fun. - Some NightsNEW YORK, NY - AUGUST 10: Lead singer Nate Ruess of the alternative rock band "fun." performs on stage during Pepsi Presents StePhest Colbchella '012: Rocktaugustfest on board the USS Intrepid Sea-Air-Space Museum on August 10, 2012 in New York City. (Photo by Neilson Barnard/Getty Images)
102 JAMZ Top 20 Countdown16. 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 Countdown17. Pitbull - Feel The Moment<> on August 9, 2012 in Los Angeles, California.
102 JAMZ Top 20 Countdown18. PSY - Gangnam StyleSouth Korean singer Psy performs during the 2012 MTV European Music Awards (EMA) at the Festhalle in Frankfurt am Main, central Germany on November 11, 2012. AFP PHOTO / DANIEL ROLAND (Photo credit should read DANIEL ROLAND/AFP/Getty Images)
102 JAMZ Top 20 Countdown19. Ellie Goulding - LightsHOLLYWOOD, 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)
102 JAMZ Top 20 Countdown20. Calvin Harris - 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)