System of a Down, also known by the acronym SOAD and often shortened to System, is a rock band from Southern California. The band was formed in 1994. It consists of Serj Tankian (lead vocals, keyboards, rhythm guitar), Daron Malakian (guitar, vocals), Shavo Odadjian (bass, background vocals) and John Dolmayan (drums). The band has achieved commercial success with the release of five studio albums; three of their studio albums debuted at number one on the Billboard 200. System of a Down has been nominated for four Grammy Awards, and won the award in 2006 for Best Hard Rock Performance for the song "B.Y.O.B.". Beginning August 13, 2006, the group went on hiatus, but announced a reunion on November 29, 2010 with several shows planned at European music festivals throughout 2011. This tour has continued through the west coast of North America as well as South America, with dates announced during the summer.