English composer and former lead singer and guitarist of Pop Will Eat Itself, Clint Mansell has been making fantastic soundtracks for the last 11 years. His original foray into soundtracks was with his score for the haunting film π in 1998. Since, he has released some of my favorite atmospheric and contemporary classic music with Requiem for a Dream and the Fountain. His track "Lux Aeterna" remains one of my favorite pieces of contemporary music despite its over use in movie trailers.
Clint Mansell - "Welcome to Lunar Industries"