Men and women now compete together in vocal categories for pop, R&B and country, instead of having separate categories for each sex.

This year, the category is best pop solo performance and Bruno Mars is the only man nominated for "Grenade." His competition includes Adele for "Someone Like You," Lady Gaga for "You and I," Pink for "(Expletive) Perfect" and Perry for "Firework."

(China.org.cn, Youku.com February 10, 2012)