PSY Gangnam Style ( Live 2012 American Music Awards) AMA

The show celebrates its 40th anniversary with a starstudded blowout from the Nokia Theatre in Los Angeles (ABC, 8 p. m. ET live, PT tapedelayed Sunday) delivered by a huge cross section of contemporary hitmakers. Taylor Swift, Usher, Pink and Pitbull will take the stage. Christina Aguilera, Linkin Park, Nicki Minaj, No Doubt, Carrie Underwood and Keha also will perform. Fans voting online will determine winners in pop, rock, country, rap, hiphop, soul, R B, alternative, adult contemporary, Latin and conte