Parabola is the name of the second single from Tool's album "Lateralus".
It was released in 2002 as a promo CD only. In support of this promo single, a music video was released — clocking in at over ten minutes because of the inclusion of the 3-minute "Parabol" lead-in (a separate track on the album), it hardly met the criteria for being broadcast on mainstream music video stations, although some channels worked around this by cutting off the "Parabol" segment.
On December 20, 2005, the song as well as the music video were released on a DVD single along with the DVD single for "Schism". The DVD also contains an optional "dual" audio commentary on the video by Jello Biafra of Dead Kennedys fame. The dual commentary consists of two separate recordings of Biafra's voice, one playing in each stereo channel.
