Brand New was an American rock band formed in 2000 from Long Island, New York. Consisting of lead vocalist and rhythm guitarist Jesse Lacey, lead guitarist Vincent Accardi, bassist Garrett Tierney and drummer Brian Lane, the band earned critical recognition as one of the most influential emo bands, and was acclaimed for their musical development and artistic innovation compared to other groups in the scene which they originated from.

In the 1990s, Lacey, Tierney and Lane played in the Levittown band the Rookie Lot, and Brand New was formed with Accardi after Lacey left his position as the founding bassist for Taking Back Sunday. The band signed to Triple Crown Records and released a pop punk debut album Your Favorite Weapon. The band began to incorporate indie rock influences on their second album Deja Entendu, released in 2003 to positive reviews over the band's stylistic changes. Its two singles "The Quiet Things That No One Ever Knows" and "Sic Transit Gloria... Glory Fades" both entered the top 40 on the UK Singles Chart. Deja Entendu was eventually certified Gold in the United States.

The demos for the band's major label debut on Interscope Records were leaked onto the internet in 2006. After reworking the material, the band released The Devil and God Are Raging Inside Me, which earned retrospective critical acclaim for its influence on emo. It was also certified Gold in the US and the single "Jesus Christ" peaked at number 30 on Billboard's Alternative Songs chart. Accardi's role as a lyricist increased on the band's fourth album Daisy (2009), which debuted at number six on the Billboard 200 and featured a more post-hardcore and noise rock sound.

While Brand New toured consistently and played several prominent festivals, the band went six years without releasing music before the singles "Mene" (2015) and "I Am a Nightmare" (2016). Brand New's fifth and final album, Science Fiction, was surprise-released in August 2017 through the band's own record label, Procrastinate! Music Traitors. It debuted at number-one on the Billboard 200, receiving both critical acclaim and commercial success.

During Brand New's final years, the band repeatedly announced plans to break up in 2018, but they have been inactive since November 2017 after Lacey was accused of sexual misconduct occurring during the band's early days.