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Danny Elfman began composing the score in January 2009. Beforehand, McG had the idea to hire Gustavo Santaolalla, who he got to speak with, to work on the human themes, while having either Thom Yorke or Jonny Greenwood for Skynet's themes. He also wanted to discuss scoring the film with Hans Zimmer, but he was unable to arrange a meeting. However, he managed to meet with The Terminator and Terminator 2 composer Brad Fiedel. McG was not interested in repeating the sounds Fiedel achieved in his films but still wanted Elfman to use those themes and ambient sounds, and give them a "Wagnerian quality".
Reprise Records released the soundtrack on May 19, 2009, which includes fifteen tracks. While Common had expressed interest in writing a song for the soundtrack, Alice in Chains' "Rooster" is the only featured song. Although not included in the soundtrack, "You Could Be Mine" by Guns N' Roses, which was featured in Terminator 2: Judgment Day, can be heard briefly in a scene of the film as well. Nine Inch Nails' "The Day The World Went Away" is played on the film's theatrical trailer, but is not included in the film or soundtrack.
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