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Nate Reuss of Fun. from the #GRAMMYNoms Concert Dec. 5th in Nashville. The 55th GRAMMY Awards air 2/10/13 on CBS! #TheWorldIsListening

Taylor Swift co-hosting the #GRAMMYNoms Concert with LL Cool J on Dec. 5th in Nashville. The 55th GRAMMY Awards airs 2/10/13 on CBS! #TheWorldIsListening

Cover Girl & GRAMMY nominee Janelle Monae performs at the #GRAMMYNoms Concert in Nashville on Dec. 5th. The 55th GRAMMY Awards air 2/10/13 on CBS! #TheWorldIsListening

Luke Bryan performs at the #GRAMMYNoms Concert on Dec. 5th in Nashville. The 55th GRAMMY Awards airs 2/10/13 on CBS! #TheWorldIsListening Photo: Kevin Winter/Getty Images

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

Co-hosts Taylor Swift and LL Cool J backstage at "The GRAMMY Nominations Concert Live!! — Countdown To Music's Biggest Night" on Dec. 5 in Nashville #TheWorldIsListening Photo: Larry Busacca / WireImage.com