Track 12 on Tool's 2001 album Lateralus. The third song of a three-part epic. See Disposition and Reflection.
This song, like the other two in the trilogy, features at least one Indian instrument; in this case, the shehnai.
An instrumental piece, this song is nonetheless a fullfilling resolution to the themes encountered on the previous two tracks. Intense, pounding guitars and distorted screaming make up the bulk of the song. Around four minutes in the guitars are forced into the background and the track becomes much quieter. As the track continues, it almost seems as though the violent guitars are trying to fight their way back into the center, until they finally break through in a stunning climax. That's about the midpoint of the song.
This is some seriously good shit. Especially live.