B.Y.O.B. is a 2005 song by American metal band System of a Down, released as the lead single from their album Mezmerize. The title stands for Bring Your Own Bombs, and the track became one of the band's best-known hits thanks to its frantic tempo, political lyrics and instantly recognisable chorus. It won a Grammy Award for Best Hard Rock Performance and has remained a staple of rock playlists, workout mixes and online edits, where its aggressive opening is often reused to add urgency to short videos.