The film score was composed by John Tavener and released on Varese Sarabande. 　　Director Alfonso Cuaron describes Tavener's "Fragments of a Prayer," as "a spiritual comment rather than a narrative support." The track features mezzo-soprano Sarah Connolly and is used as a powerful motif. Unlike most composers, Tavener chose not to score the piece to the film, but to the screenplay instead. 　　The poetry of William Blake is featured in the lyrics to "Eternity's Sunrise", a work Tavener had previously written and dedicated to Princess Diana after her death. 　　Gustav Holst's "Mars" is used in the film although it is not featured on the album.