102 JAMZ Top 20 Countdown20. Rihanna - StaySinger 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 Countdown19. Taylor Swift - I Knew You Were TroubleTORONTO, ON - JUNE 16: Taylor Swift arrives on the red carpet at the 2013 MuchMusic Video Awards at Bell Media Headquarters on June 16, 2013 in Toronto, Canada. (Photo by Jag Gundu/Getty Images)
102 JAMZ Top 20 Countdown18. Britney Spears - Ooh La Laat 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 Countdown17. Ke$ha - Crazy Kidsarrives at the 2012 MTV Video Music Awards at Staples Center on September 6, 2012 in Los Angeles, California.
102 JAMZ Top 20 Countdown16. Bruno Mars - Treasureperforms onstage at the 54th Annual GRAMMY Awards held at Staples Center on February 12, 2012 in Los Angeles, California.
102 JAMZ Top 20 Countdown15. Rihanna & David Guetta - Right NowLOS ANGELES, CA - APRIL 7: Recording artist Rihanna attends a game between the Los Angeles Clippers and the Los Angeles Lakers at Staples Center on April 7, 2013 in Los Angeles, California. 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. Mandatory Copyright Notice: Copyright 2013 NBAE (Photo by Andrew D. Bernstein/NBAE via Getty Images)
102 JAMZ Top 20 Countdown14. Fall Out Boy - My Songs Know What You Did In The DarkNEW 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)
102 JAMZ Top 20 Countdown13. Ariana Grande - The Wayarrives at the 2013 MTV Movie Awards at Sony Pictures Studios on April 14, 2013 in Culver City, California.
102 JAMZ Top 20 Countdown11. Mariah Carey - #beautifulNEW YORK, NY - MAY 24: Singer Mariah Carey performs on ABC's "Good Morning America" at Rumsey Playfield on May 24, 2013 in New York City. (Photo by Andrew H. Walker/Getty Images)
102 JAMZ Top 20 Countdown10. Macklemore - Can't Hold UsNEW YORK, NY - MAY 20: Macklemore backstage at BET's "106 & Park" at BET Studios on May 20, 2013 in New York City. (Photo by Ilya S. Savenok/Getty Images for BET)
102 JAMZ Top 20 Countdown9. Selena Gomez - Come & Get ItLAS VEGAS, NV - MAY 19: Singer Selena Gomez (C) performs during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)
102 JAMZ Top 20 Countdown8. Jason Derulo - The OthersideLAS 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)
102 JAMZ Top 20 Countdown7. Justin Timberlake - MirrorsNEW 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)
102 JAMZ Top 20 Countdown6. Calvin Harris & Ellie Goulding - Need Your LoveLOS 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 Countdown5. 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)
102 JAMZ Top 20 Countdown4. Miley Cyrus - We Can't StopLOS ANGELES, CA - JUNE 12: Miley Cyrus attends the New Myspace launch event on June 12, 2013 in Los Angeles, California. (Photo by Jason Kempin/Getty Images for Myspace)
102 JAMZ Top 20 Countdown3. Icona Pop - I Love ItMIAMI BEACH, FL - JUNE 29: Aino Jawo and Caroline Hjelt of Icona Pop pose in the Wonderwall Portrait Studio at the iHeartRadio Ultimate Pool Party Presented by VISIT FLORIDA at Fontainebleau's BleauLive in Miami featuring live performances by Pitbull, Ke$ha, Afrojack, Icona Pop, Krewella and Jason Derulo on June 29, 2013 in Miami Beach, Florida. (Photo by Christopher Polk/Getty Images for Clear Channel)
102 JAMZ Top 20 Countdown2. 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 Countdown1. Daft Punk - Get LuckyLOS 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)