Fun (often written as fun.) is an American indie pop band based in New York, New York that was formed by Nate Ruess, formerly of The Format. Ruess left Arizona to develop his career in New York City. Ruess formed the band with Andrew Dost of Anathallo and Jack Antonoff of Steel Train. Fun recorded their debut album, Aim and Ignite in August 2008 with producer Steven McDonald and arranger Roger Joseph Manning Jr., the former keyboardist of Jellyfish.