102 JAMZ Top 20 Countdown20. Lumineers - Ho HeyNASHVILLE, TN - DECEMBER 05: Wesley Schultz, Neyla Pekarek, and Jeremiah Fraites of The Lumineers speak onstage at The GRAMMY Nominations Concert Live!! held at Bridgestone Arena on December 5, 2012 in Nashville, Tennessee. (Photo by Kevin Winter/Getty Images)(Photo by Kevin Winter/Getty Images)
102 JAMZ Top 20 Countdown19. Macklemore & Ryan Lewis - Thrift ShopSEATTLE - APRIL 08: Seattle recording artist Macklemore performs a tribute to Mariners broadcaster Dave Niehaus, who passed away last November, prior to the Mariners' home opener against the Cleveland Indians at Safeco Field on April 8, 2011 in Seattle, Washington. (Photo by Otto Greule Jr/Getty Images)
102 JAMZ Top 20 Countdown18. Alicia Keys - 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 Countdown17. Ke$ha - C'MonLOS ANGELES, CA - NOVEMBER 18: Singer Kesha attends the 40th American Music Awards held at Nokia Theatre L.A. Live on November 18, 2012 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)
102 JAMZ Top 20 Countdown16. Ke$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 Countdown15. Maroon 5 - One More NightXXX performs during the 2012 F1 Singapore on September 22, 2012 in Singapore.
102 JAMZ Top 20 Countdown14. Calvin Harris/ 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 Countdown13. 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 Countdown12. P!nk - 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 Countdown11. 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 Countdown10. Pitbull - Don't Stop The Party<> on August 9, 2012 in Los Angeles, California.
102 JAMZ Top 20 Countdown9. Trey Songz - Heart AttaclATLANTA, 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 Countdown8. 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 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)
102 JAMZ Top 20 Countdown6. Taylor Swift - I Knew You Were TroubleSinger Taylor Swift performs during New Year's celebrations on Times Square on December 31, 2012 in New York. A million people cheered in New York's Times Square as the traditional crystal ball dropped to mark the start of 2013, bringing a rolling global New Year's party that kicked off in Australia to US shores. AFP PHOTO/EMMANUEL DUNAND (Photo credit should read EMMANUEL DUNAND/AFP/Getty Images)
102 JAMZ Top 20 Countdown5. Justin Bieber/ Nicki Minaj - Beauty And A Beatat The Staples Center on October 2, 2012 in Los Angeles, California.
102 JAMZ Top 20 Countdown4. 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 Countdown3. 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 Countdown2. 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 Countdown1. Rihanna - DiamondsSinger Rihanna performs live on stage as part of her 777 tour at The Forum on November 19, 2012 in London, England.