The Original Motion Picture Soundtrack of Peter Jackson's The Lord of the Rings trilogy refers to the order of the music of the films in their final, cinematic renditions as heard throughout the three films. The soundtracks were orchestrated and produced by Howard Shore, from 2000 to 2003 - he also composed all of the music except for the credit songs: "May It Be" by Enya, "Gollum's Song" by Fran Walsh, and "Into the West" by Annie Lennox.
Most of the soundtracks were performed by the London Philharmonic Orchestra. London Voices, the London Oratory School Schola, the New Zealand Symphony Orchestra, certain actors from the films (such as Viggo Mortensen and Billy Boyd), and professional singers also were featured.
Each Original Motion Picture Soundtrack was released as a 1-disc CD under Reprise Records, in the year its respective film made its debut.
"Lord of the Rings soundtrack", when said in passing, customarily means the Original Motion Picture Soundtrack.
The "Complete Recordings" are the larger, more thorough compilation of the earlier renditions of the same music, making up ten hours of orchestral music total. Each of the Complete Recordings for the three Lord of the Rings films, in their release, are three to four discs long, and are comprised of many "alternate", "mock-up", and "complete" versions of Howard Shore's composed themes.