Fun (stylized as fun.) is an American alternative rock band. The band is from New York City. It was formed by Nate Ruess who used to be in The Format. After The Format breakup in 2008, Ruess formed Fun. The band has so far released two albums. Their first album "Aim and Ignite" was released in 2009. Their second album "Some Nights" was released in February 2012.