Music's biggest names gather to perform on this one-hour television special during which the nominees for the 51st Annual GRAMMY Awards are announced. This live event will also celebrate the grand opening of the GRAMMY Museum at L.A. Live. LL Cool J and Taylor Swift will host while musicians Mariah Carey, Celine Dion, Foo Fighters, B.B. King, John Mayer and more are set to perform.