"Parabola" is a song by the American rock band Tool, the song was released as the second single from their third studio album Lateralus. It was released in 2002 as a promo only, however, on December 20, 2005, the single was re-released, which includes the song and a DVD containing the music video and 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. The DVD was released alongside a DVD single for "Schism" as well.