Xibalba ( /ʃɨˈbɒlbə/), roughly translated as "place of fear", is the name of the underworld in Maya mythology, ruled by the Maya death gods and their helpers. In 16th-century Verapaz, the entrance to Xibalba was traditionally held to be a cave in the vicinity of Cobán, Guatemala. According to some of the K'iche' Maya presently living in the vicinity, the area is still associated with death. Cave systems in nearby Belize have also been referred to as the entrance to Xibalba.

Another physical incarnation of the road to Xibalba as viewed by the K'iche' is the dark rift which is visible in the Milky Way.

Xibalba is described in the Popol Vuh as a court below the surface of the Earth associated with death and with twelve gods or powerful rulers known as the Lords of Xibalba. The first among the Maya Death Gods ruling Xibalba were Hun-Came (One Death) and Vucub-Came (Seven Death), though Hun-Came is the more senior of the two. The remaining ten Lords are often referred to as demons and are given commission and domain over various forms of human suffering: to cause sickness, starvation, fear, destitution, pain, and ultimately death. These Lords all work in pairs and are Xiquiripat (Flying Scab) and Cuchumaquic (Gathered Blood), who sicken people's blood; Ahalpuh (Pus Demon) and Ahalgana (Jaundice Demon), who cause people's bodies to swell up; Chamiabac (Bone Staff) and Chamiaholom (Skull Staff), who turn dead bodies into skeletons; Ahalmez (Sweepings Demon) and Ahaltocob (Stabbing Demon), who hide in the unswept areas of people houses and stabbed them to death; and Xic (Wing) and Patan (Packstrap), who caused people to die coughing up blood while out walking on a road. The remaining residents of Xibalba are thought to have fallen under the dominion of one of these Lords, going about the face of the Earth to carry out their listed duties.

Clinton Darryl "Clint" Mansell, (born 7 January 1963) is an English musician, composer, and former lead singer and guitarist of the band Pop Will Eat Itself.

After the disbanding of Pop Will Eat Itself in 1996, Mansell was introduced to film scoring when director Darren Aronofsky, hired him to score his debut film, π. Mansell then wrote the score for the next Aronofsky film, Requiem for a Dream, which has been well received. Its main composition "Lux Aeterna" has become extremely popular, appearing in a wide variety of advertisements and film trailers.

Mansell's composition for The Fountain was nominated for Best Original Score at the 64th Annual Golden Globe Awards. His other notable film scores include Moon, Smokin' Aces, The Wrestler, and Black Swan.

Mansell was the lead singer and guitarist of Pop Will Eat Itself. When PWEI signed to Nothing Records, Mansell became close friends with Trent Reznor, and he performed backing vocals on the 1999 album The Fragile by Nine Inch Nails.

Mansell's score for Darren Aronofsky's π was followed up by his score for Aronofsky's next film, Requiem for a Dream, which became a cult hit. Since their first collaboration in 1996, Mansell has composed the music to every Aronofsky film.