The score was composed by regular Spielberg collaborator John Williams, who was inspired by Bernard Herrmann's film music;[68] Instead of focusing on the science fiction elements, he made a score suitable for the film noir, including the use of female singer in the some sequences, and emotional themes, which Williams considered unusual for that genre.[49] Several classical pieces, including Franz Schubert's Symphony No. 8 (Unfinished Symphony),[69] Haydn string quartet (Op. 64, No. 1), Tchaikovsky's Symphony No. 6 (Pathétique), were implemented in the score,[70] though Williams said that the choices of using classical pieces were made by the studio.
Besides composing, Williams conducted the score, with orchestration by John Neufeld and vocals by Deborah Dietrich. The music was released on June 18, 2002 by DreamWorks Records in CD, vinyl and cassettes, and re-issued by Geffen Records in mid-2014 for streaming media and download.[71] The full score as heard in the film, was released into a 2-disc "expanded edition" in 2019, which was marketed by La-La Land Records, along with several alternate and unused tracks as bonus material.[72]
