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Adam Levine performs at the #GRAMMYNoms Concert in Nashville on Dec. 5th. The 55th GRAMMY Awards air 2/10/13 on CBS! #TheWorldIsListening Photo: Christopher Polk/Getty Images
Bruno Mars performs "Just The Way You Are" during "The GRAMMY Nominations Concert Live!!" in 2010. The 55th GRAMMY Awards airs 2/10/13 on CBS! #TheWorldIsListening
Fun.'s Nate Ruess and Janelle Monáe perform on "The GRAMMY Nominations Live!! — Countdown To Music's Biggest Night" on Dec. 5 in Nashville. Tune in to the 55th GRAMMY Awards on 2/10/13 on CBS! #TheWorldIsListening Photo: Kevin Winter/Getty Images
Nate Reuss of fun.