"Lux Aeterna" (sometimes "Lux Æterna") (pronounced [lʊks ɛtɛrna]; Latin for "eternal light") is a composition by Clint Mansell, the leitmotif of the 2000's movie Requiem for a Dream, and the penultimate piece in the movie's soundtrack.
In popular culture
The popularity of this piece led to its use in popular culture outside the film, most notably in film and teaser trailers, such as Sunshine, and multiple remixes and remakes by other producers. A version of the track was re-orchestrated with a choir and full orchestra for The Lord of the Rings: The Two Towers trailer. It was arranged by Simone Benyacar, Daniel Nielsen, and Veigar Margeirsson.
The orchestrated version was made available as part of the Requiem for a Tower album release from Corner Stone Cues.