"Toxicity" is a single by System of a Down, released in 2002. It was originally released on the Toxicity album (2001).
The writing credit for the song is Malakian/Odadjian/Tankian.
Although it never achieved the mainstream success of "Chop Suey!" and "B.Y.O.B.", Toxicity remains one of System of a Down's most popular songs among fans. The song was ranked #14 on VH1's 40 Greatest Metal Songs .
The song is in C minor key and it is played on dropped C tuned guitar. .