Duality is a track by American heavy metal band Slipknot, released in 2004 as the lead single from their third album, Vol. 3: The Subliminal Verses. It became one of the band's most widely recognised songs, reaching a broad rock audience beyond their core metal fanbase and remaining a staple of their live sets. Online, the opening riff and shouted chorus have been reused in edits, memes and gaming montages, keeping the track familiar to younger audiences who may discover it first through short-form video rather than the full album.