In what could turn out to be her big coming-out moment, indie rocker and Best New Artist nominee Feist, famous for the “1234″ song featured in a ubiquitous iPod ad, has been added to the list of performers for the upcoming Grammys Awards ceremony. Also joining the performer list are Alicia Keys and country star Brad Paisley, as well as a special tribute to the Beatles featuring the casts of the Las Vegas show “LOVE by Cirque du Soleil” (based on the Fab Four’s music) and the Beatles-inspired big-screen musical “Across the Universe.”