Fall Out Boy is an American rock band formed in Wilmette, Illinois, a suburb of Chicago, in 2001. The band consists of vocalist and guitarist Patrick Stump, bassist Pete Wentz, guitarist Joe Trohman, and drummer Andy Hurley. The band originated from Chicago's hardcore punk scene, with which Wentz was heavily involved. The group was formed by Wentz and Trohman as a pop punk side project of their respective hardcore bands, and Stump joined shortly thereafter. The group went through a succession of drummers before landing Hurley and recording their debut album, Take This to Your Grave (2003). The album became an underground success and helped the band gain a dedicated fanbase through heavy touring, as well as some moderate commercial success.

Project Rocket/Fall Out Boy is a split EP by American rock bands Project Rocket and Fall Out Boy, released by Uprising Records in 2002. It was the first official release for both bands. The split EP has sold over 25,000 copies in the United States as of August 2008, according to Billboard.