Mezmerize is the fourth studio album by the Armenian-American heavy metal band System of a Down. The album sold over 450,000 copies in its first week, and immediately topped the Billboard 200.
The band went on hiatus in 2006 and reunited in 2010. Other than two new songs in 2020 in response to the Second Nagorno-Karabakh War ("Protect the Land" and "Genocidal Humanoidz"), System of a Down has not released a full-length record since the Mezmerize and Hypnotize albums in 2005.
"B.Y.O.B." ("Bring Your Own Bombs") was released as the lead single from Mezmerize. It was written in protest against the Iraq War, and questions the integrity of military recruiting in America. The song reached number 27 on the US Billboard Hot 100, the band's highest peak to date on the chart.
"B.Y.O.B." won a Grammy Award in 2006 for Best Hard Rock Performance.