Fall Out Boy is an American rock band formed in 2001 in Wilmette, Illinois, and became one of the defining acts of the 2000s emo-pop and pop-punk revival. Known for Patrick Stump's distinctive vocals, Pete Wentz's lyrical style, and their ability to blend rock with pop and alternative influences, the band achieved global recognition with albums like From Under the Cork Tree, Infinity on High, and Save Rock and Roll. Their energetic performances and genre-blending sound have made them one of the most influential mainstream rock bands of the 21st century.

Although Fall Out Boy and ONE OK ROCK have not collaborated musically, they share a notable moment of interaction. On April 1, 2013, ONE OK ROCK held a USTREAM live talk session with Fall Out Boy — a rare cross-continental conversation between two rock acts. This event allowed both bands to discuss music, and highlight their mutual respect.