Fun.

Fun. (often stylized as fun.) is an American indie pop band based in New York City that was formed by Nate Ruess, formerly of The Format. After the 2008 breakup of The Format, Ruess then formed Fun with Andrew Dost of Anathallo and Jack Antonoff of Steel Train. Fun has released two albums, their debut Aim and Ignite in 2009 and their latest Some Nights in February, 2012.

The band is best known for their hit single "We Are Young" featuring Janelle Monáe, which reached number one on the Billboard Hot 100 and Digital Songs charts. It became the first rock/alternative song to top the Billboard Hot 100 chart since Coldplay's Viva La Vida in 2008.