what genre is fun.
For other uses, see Fun (disambiguation). Fun (stylized as fun.) is an American indie pop band based in New York City. It was formed by Nate Ruess, former lead singer of The Format, with Andrew Dost of Anathallo and Jack Antonoff of Steel Train. Fun has released two albums: Aim and Ignite in August 2009 and Some Nights in February 2012.