System of a Down is an Armenian-American heavy metal band formed in Glendale, California, in 1994. It currently consists of members Serj Tankian, Daron Malakian, Shavo Odadjian, and John Dolmayan, who replaced original drummer Andy Khachaturian in 1997.The band achieved commercial success with the release of five studio albums, three of which debuted at number one on the US Billboard 200. System of a Down has been nominated for four Grammy Awards and their song "B.Y.O.B." won a Grammy Award for Best Hard Rock Performance in 2006. The band went on hiatus in 2006 and reunited in 2010, and they have continued to perform live occasionally since then. It has not released a studio album since Mezmerize and Hypnotize in 2005, but issued two new charity songs to benefit victims and support Armenian defenders in the 2020 Nagorno-Karabakh war. The band has sold over 40 million records worldwide, while two of their singles "Aerials" and "Hypnotize" reached number one on Billboard's Alternative Songs chart.