Grammy Awards 2009

The countdown to the biggest night in music began when singing superstars Taylor Swift, Christina Aguilera and Celine Dion gathered at L.A.'s Nokia Theater for the first-ever Grammy Nominations Concert Live. Mariah Carey kicked off the hour-long CBS special with a primetime performance of the holiday hit "Christmas (Baby Please Come Home)" before this year's list of nominees was revealed. And with John Mayer, Foo Fighters and legendary guitar man B.B. King also taking to the stage, Grammy season started out on a high note.

—With reporting by Andrea Simpson and Lisa Tilson