Lux Æterna (Classical Latin: [ˈluːks ae̯ˈtɛrna], Ecclesiastical Latin: [ˈluks eˈterna]; "eternal light") is an orchestral composition by Clint Mansell.
Performed by the Kronos Quartet, it forms a leitmotif in the 2000 film Requiem for a Dream, and is the penultimate piece in the movie's soundtrack.
[2][3] Both "Lux Aeterna" and the re-orchestrated version, "Requiem for a Tower" that was created for the trailer of The Lord of the Rings: The Two Towers, have been used in multiple forms of media, including the film trailers for The Da Vinci Code, I Am Legend, Sunshine and Babylon A.D.; trailers for the video games Assassin's Creed and Lord of the Rings: Return of the King; advertising campaigns for such products as Canon PowerShot cameras, Molson Canadian and Canadian wireless carrier Telus; and on television such as in the series So You Think You Can Dance as well as a promo spot the series Flash Forward.
[4] A re-orchestrated version of "Lux Aeterna", titled "Requiem for a Tower", was arranged by composers Simone Benyacar, Dan Nielsen and Veigar Margeirsson for the trailer of The Lord of the Rings: The Two Towers.
[6] While the release was originally made physically,[7] production was discontinued indefinitely with increased digital sales of the album on major electronic music distributors iTunes[8] and Amazon MP3.