Watch System of a Down, Chino Moreno Perform 'Toxicity' at Rock in Rio

System of a Down brought out their “longtime brother” Chino Moreno of Deftones to perform their classic song “Toxicity” during their headlining set at Brazil’s Rock in Rio festival (via Loudwire).

Moreno entered the stage after the band thrashed through Mezmerize cut “Cigaro.” Moreno and System of a Down’s lead singer…