102 JAMZ Top 20 Countdown1. Katy Perry - RoarSinger Katy Perry arrives at the MTV Video Music Awards August 25, 2013 at the Barclays Center in New York. AFP PHOTO/Emmanuel DUNAND (Photo credit should read EMMANUEL DUNAND/AFP/Getty Images)
102 JAMZ Top 20 Countdown2. Jay Z and Justin Timberlake - Holy GrailHOUSTON, TX - FEBRUARY 17: Rapper Jay-Z looks on during the 2013 NBA All-Star game at the Toyota Center on February 17, 2013 in Houston, Texas. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Ronald Martinez/Getty Images)
102 JAMZ Top 20 Countdown3. Zedd - ClarityNEW YORK, NY - JANUARY 16: DJ Zedd performs at MTV's 2013 "Artists To Watch" Concert at Highline Ballroom on January 16, 2013 in New York City. (Photo by Stephen Lovekin/Getty Images)
102 JAMZ Top 20 Countdown4. Lana Del Rey - Summertime SadnessUS singer Lana del Rey performs during a concert at the HMH concert hall in Amsterdam, on May 29, 2013. AFP PHOTO / ANP / PAUL BERGEN ***netherlands*** (Photo credit should read PAUL BERGEN/AFP/Getty Images)
102 JAMZ Top 20 Countdown5. Calvin Harris and Ellie Goulding - I Need Your Loveattends DIRECTV's 2013 National Ad Sales Upfront on May 7, 2013 in New York City.
102 JAMZ Top 20 Countdown6. Drake - Hold On, We're Going HomeNEW YORK, NY - AUGUST 25: Rapper Drake attends the 2013 MTV Video Music Awards at the Barclays Center on August 25, 2013 in the Brooklyn borough of New York City. (Photo by Jamie McCarthy/Getty Images for MTV)
102 JAMZ Top 20 Countdown7. Capital Cities - Safe And SoundMembers of US rock band "Capital cities" Ryan Merchant (L) and Sebu Simonian pose on September 16, 2013 in Paris. AFP PHOTO FRANCOIS GUILLOT (Photo credit should read FRANCOIS GUILLOT/AFP/Getty Images)
102 JAMZ Top 20 Countdown8. Imagine Dragons - Radioactivebackstage during the 2013 Budweiser Made In America Festival at Benjamin Franklin Parkway on August 31, 2013 in Philadelphia, Pennsylvania.
102 JAMZ Top 20 Countdown9. Miley Cyrus - Wrecking Ballattends the premiere of Relativity Media's "Paranoia" at DGA Theater on August 8, 2013 in Los Angeles, California.
102 JAMZ Top 20 Countdown10. Lady Gaga - ApplauseNEW YORK, NY - SEPTEMBER 06: Lady Gaga speaks onstage at The Daily Front Row's Fashion Media Awards at Harlow on September 6, 2013 in New York City. (Photo by D Dipasupil/Getty Images for The Daily Front Row)
102 JAMZ Top 20 Countdown11. Lorde - RoyalsBYRON BAY, AUSTRALIA - JULY 28: Lorde performs for fans on day 3 of the 2013 Splendour In The Grass Festival on July 28, 2013 in Byron Bay, Australia. (Photo by Mark Metcalfe/Getty Images)
102 JAMZ Top 20 Countdown12. Macklemore - Same LoveNEW YORK, NY - AUGUST 25: Macklemore performs onstage during the 2013 MTV Video Music Awards at the Barclays Center on August 25, 2013 in the Brooklyn borough of New York City. (Photo by Neilson Barnard/Getty Images for MTV)
102 JAMZ Top 20 Countdown13. Avicii - Wake Me UpBEVERLY HILLS, CA - FEBRUARY 09: DJ Avicii arrives at Clive Davis & The Recording Academy's 2013 Pre-GRAMMY Gala and Salute to Industry Icons honoring Antonio "L.A." Reid at The Beverly Hilton Hotel on February 9, 2013 in Beverly Hills, California. (Photo by Jason Merritt/Getty Images)
102 JAMZ Top 20 Countdown14. Selena Gomez - Slow DownLOS ANGELES, CA - APRIL 27: Actress/singer Selena Gomez arrives to the 2013 Radio Disney Music Awards at Nokia Theatre L.A. Live on April 27, 2013 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images)
102 JAMZ Top 20 Countdown15. Bonnie McKee - American GirlBEVERLY HILLS, CA - MAY 14: Singer/Songwriter Bonnie McKee attends the 2013 BMI Pop Awards at the Beverly Wilshire Four Seasons Hotel on May 14, 2013 in Beverly Hills, California. (Photo by Chelsea Lauren/Getty Images for BMI)
102 JAMZ Top 20 Countdown16. Ariana Grande - The Wayattends the 10th annual Style Awards during Mercedes Benz Fashion Week Spring 2014 at Lincoln Center on September 4, 2013 in New York City.
102 JAMZ Top 20 Countdown17. Justin Timberlake - Mirrorsonstage during the 2013 BET Awards at Nokia Theatre L.A. Live on June 30, 2013 in Los Angeles, California.
102 JAMZ Top 20 Countdown18. Robin Thicke - Give It 2 Uonstage during the 2013 BET Awards at Nokia Theatre L.A. Live on June 30, 2013 in Los Angeles, California.
102 JAMZ Top 20 Countdown19. Britney Spears - Work CARSON, CA - MAY 11: Singer Britney Spears speaks onstage at 102.7 KIIS FM's Wango Tango on May 11, 2013 in Carson, California. (Photo by Kevin Winter/Getty Images)
102 JAMZ Top 20 Countdown20. Robin Thicke - Blurred LinesMANNHEIM, GERMANY - MAY 30: Singer Robin Thicke and the four finalists Sabrina Elsner (R), Luise Will (2ndL), Lovelyn Enebechi (2ndR) and Maike van Grieken (L) perform during the final of 'Germany's Next Top Model by Heidi Klum' TV show at SAP Arena on May 30, 2013 in Mannheim, Germany. (Photo by Thomas Lohnes/Getty Images)