Rap star Eminem and country band Lady Antebellum lead the way at this year's American Music Awards, with five nods each.
Teen star Justin Bieber has four nominations, while Katy Perry, Ke$ha, B.o.B. and Usher all have three.
Bieber goes head-to-head with Eminem in three categories, including artist of the year, where the nominees also include Perry, Ke$ha and Lady Gaga.
Fans can vote online and the winners will be unveiled in November.
Bon Jovi, Usher and Pink are lined up to perform at the ceremony which will tale place at the Nokia Theater in Los Angeles.
Nominees are determined by radio airplay, record sales, activity on social networks and video viewing.