Clint Mansell—the composer for Aronofsky's previous films Pi and Requiem for a Dream—reprised his role for The Fountain. The San Francisco-based string quartet Kronos Quartet—who previously performed for the Requiem for a Dream soundtrack—and Scottish post-rock band Mogwai also contributed to the film score.[1] Darren Aronofsky hoped that David Bowie—whose song "Space Oddity" helped influence the film's space traveler storyline—would record a song when the musical artist worked briefly with composer Clint Mansell during production.[2] Aronofsky planned for Bowie to rework pieces of the score and to vocalize them, but the plan was unsuccessful.[3] After the score was completed, Nonesuch Records, the home of The Fountain musical contributor Kronos Quartet, released the soundtrack on November 21, 2006.[4]
Mansell researched possible scores to compose one tying together the three storylines. He sought to have an organic feeling to the score and explored implementing orchestral and electronic elements that would have "a real human element to them that breathes".[5] Contrary to most films' scores composed in post-production, Mansell's score was composed concurrently with the film's production; he created a mood that flourished as the film progressed. The composer described the parallel process, "It's instinct and listening to what the film is telling you it needs".[6]
Mansell drew from five to six years of writing material for The Fountain. The composer planned for the score to be pure percussion when the film was first meant to be epic in scale. Mansell, lacking classical training, collaborated with arranger Justin Skomarovsky in creating the score. They deconstructed the composer's initial pieces for The Fountain and re-played them in a key so the lead melodies could harmonically play with every progression. The song "Together We Will Live Forever" was an electronic piece designed by Mansell to be the protagonist's memory theme. Antony Hegarty, lead singer of Antony and the Johnsons, was commissioned to create a vocal piece over Skomarovsky's piano arrangement of "Together We Will Live Forever" for the end credits, but the director decided that the vocals would not be appropriate to end the film. The song was ultimately performed by pianist Randy Kerber.[3]
The content and research agency Ramp Industry launched The Fountain Remixed, an official website driven by user-generated content. Users could download freely provided audio parts from The Fountain's film score, remix the music, and upload the work onto the website to be evaluated by other users.[10]