Production
Major sets for the city of Troy were built in the Mediterranean island of Malta at Fort Ricasoli from April to June 2003. Other important scenes were shot in Mellieħa, a small town in the north of Malta, and on the small island of Comino. The outer walls of Troy were built and filmed in Cabo San Lucas, Mexico.
Music
Composer Gabriel Yared originally worked on the score for Troy for over a year, having been hired by the director, Wolfgang Petersen.
Yared wrote and recorded his score and Tanja Tzarovska provided vocals on various portions of the music, as she later would on composer James Horner's version of the soundtrack. However, after having screened the film with an early incomplete version of the score, the reactions at test screenings were against it and in less than a day Yared was off the project without being given a chance to fix or change his music, while Warner Bros was already looking for a replacement. According to Yared, his score was removed due to a complaint by the screening audience that the score was too "old-fashioned".
The replacement score was written by composer James Horner in about four weeks. He utilized Tanja Tzarovska's vocals, traditional Eastern Mediterranean music and brass instruments. Drums are conspicuous in the most dramatic scenes; most notably, in the duel between Achilles and Hector. His instrumental scenes have themes very reminiscent of Rachmaninoff's Symphony No. 1 and Benjamin Britten's War Requiem. A suspenseful note progression introduced in Willow was played numerous times in the score, particularly in battle scenes.
Horner also collaborated with American singer/songwriter Josh Groban and lyricist Cynthia Weil to write an original song for the film's end credits. The product of this collaboration, "Remember" was performed by Groban with additional vocals by Tzarovska. The song is available on the film's original soundtrack.
Horner described Yared's rejected score as "atrocious", and said "it was not because Gabriel isn't a gifted writer, it's because he doesn't have any knowledge of writing film scores, real film scores like that".
Around the time of the film's release in theaters, Gabriel Yared briefly made portions of his rejected score available on his personal website, which was later removed at the request of Warner Brothers. Bootleg versions exist on the Internet. Yared's score has since gained much attention from the fans of film music. Several petitions were made requesting the release of Yared's score either on a limited edition CD or as a bonus feature or secondary audio track on the film's DVD. Those requests however, have been denied by Warner Bros.