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Fun. | GRAMMY.com

GRAMMY.com | The Official Site of Music's Biggest Night

GRAMMY.com | The Official Site of Music's Biggest Night

GRAMMY.com | The Official Site of Music's Biggest Night

Taylor Swift And Fun. | GRAMMY.com

Fun.'s Nate Ruess | GRAMMY.com

Green Day | GRAMMY.com

Train | GRAMMY.com

Ludacris | GRAMMY.com

Adele | GRAMMY.com

U2 | GRAMMY.com

Mumford & Sons | GRAMMY.com

Alicia Keys | GRAMMY.com

fun.

Fun. - Some Nights

Bruno Mars | GRAMMY.com

Jay-Z | GRAMMY.com

Nate Ruess | GRAMMY.com

55th GRAMMY Award nominee - Album Of The Year Some Nights - Fun.

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

They're fun, and happy and they instantly turn my frown upside down