Jay-Z performs with U2 in Melbourne. (credit: Mark Metcalfe/Getty Images)
Eminem
(credit: Kevin Winter/Getty Images)
Adam Lambert
(credit: Jemal Countess/Getty Images)
Mumford & Sons
(credit: Chris Jackson/Getty Images)
Orianthi
(credit: Frederick M. Brown/Getty Images)
Alicia Keys
(credit: Stephen Lovekin/Getty Images)
Sade
(credit: Stephen Lovekin/Getty Images)
Lady Gaga
(credit: Kevin Winter/Getty Images)
Florence + The Machine
(credit: Jason Kempin/Getty Images)
Kings of Leon
(credit: DOMINIQUE FAGET/AFP/Getty Images)
US singer B.O.B performs during the 2010
US singer B.O.B performs during the 2010 MTV Europe Music (EMA) awards host in Madrid. (credit: DOMINIQUE FAGET/AFP/Getty Images)
Miranda Lambert
Miranda Lambert attends the 44th Annual CMA Awards at the Bridgestone Arena on November 10, 2010 in Nashville, Tennessee. (credit: Larry Busacca/Getty Images)
The Zac Brown Band
Zac Brown and The Zac Brown Band perform as part of Aloft Hotels Presents Live in the Vineyard on November 13, 2010 in Napa, California. (credit: Tim Mosenfelder/Getty Images)
Neon Trees
Chris Allen, Tyler Glenn, Elaine Bradley, and Branden Campbell of Neon Trees pose at Aloft Hotels Presents Live in the Vineyard on November 13, 2010 in Napa, California. (credit: Tim Mosenfelder/Getty Images)
Lady Antebellum
(credit: Rick Diamond/Getty Images)
Drake
(credit: MARK RALSTON/AFP/Getty Images)
Usher
(credit: Kevork Djansezian/Getty Images)
Taio Cruz
(credit: Charley Gallay/Getty Images)
Ke$ha
(credit: Frederick M. Brown/Getty Images)
Susan Boyle
Reality TV star turned recording artist Susan Boyle. (credit: Jemal Countess)
Justin Bieber Attends 'My Worlds The Collection' Photocall in Madrid
(credit: Carlos Alvarez/Getty Images)
Katy Perry
Katy Perry performs onstage at the GRAMMY Nominations Concert Live! at the Club Nokia on November 30, 2010 in Los Angeles, California. (credit: Kevin Winter/Getty Images)
Taylor Swift
Honoree Taylor Swift at the CMT Artists of the Year at The Factory on November 30, 2010 in Franklin, Tennessee. (credit: Rick Diamond/Getty Images)