The band fun. is an indie pop-rock band that has some roots in alternative rock. Nate Ruess, the lead singer, describes fun.'s music as theatrical with hip-hop elements and modernized 1970s songwriting. He was inspired to add hip hop elements after listening to Drake and Kanye West albums.
Lyrically, contrary to the band's name, fun. has been compared favorably to the dark existential musings of The National. "Some Nights," the title track from their second studio album, contains afrobeat style drumming. The song resembles the emphatic arena rock stylings of Queen, which contrast with the lyrics that convey existential angst.