With Serj Tankian's unhinged growl and machine-gun vocal delivery, System of a Down's stylistic curveballs clobber with the same intensity as their chart-toppers. “Violent Pornography” switches between a mad, bopping verse and heavy metal chug that shows off just how weird they get. The thrashy track “Psycho” teases out clean, Middle Eastern-influenced leads between blasts of grinding overdrive.