I have somehow downloaded a song by the band Tool. The file is called Systema Encéphale. I cannot find this song anywhere on the official record. It’s not on Opiate, Lateralus, Ænima, Salival or Undertow. A google search gave me nothing.
It’s 6:33 long, instrumental, but with some talking in the beginning and the end. There is one guy saying: “Is she the one who has that fucked up voice?”, and another guy saying: “haha, sounds perfect”, as well as some other conversation.