"Mezmerize" is the fourth studio album by the American rock band System of a Down, released on May 17, 2005. The album features a blend of alternative metal and hard rock, showcasing the band's unique sound characterized by heavy guitar riffs and dynamic vocals. It includes popular tracks like "B.Y.O.B." and "Question!" which received significant radio play and critical acclaim. The album was produced by Rick Rubin, a renowned music producer known for his work with various artists across different genres. "Mezmerize" debuted at number one on the Billboard 200 chart, solidifying System of a Down's status in the music industry.