Lost features incidental music composed by Michael Giacchino, whose score is primarily orchestral and incorporates several recurring themes for events and characters. The score is performed by the Hollywood Studio Symphony Orchestra. In the official Lost Podcast, Michael Giacchino revealed that he achieved some of the sounds for the score using unusual instruments, such as striking suspended pieces of the plane's fuselage. Two soundtracks have been released chronicling this music.
| Soundtrack (Season One)
On March 21, 2006, the original television soundtrack to Lost was released by the record label Varese Sarabande. It includes full length versions of the themes heard on the show during the first season.
| Soundtrack (Season Two)
On October 3, 2006, Varese Sarabande released another soundtrack album featuring music composed by Giacchino from the show's second season.
| Soundtrack (Season Three)
On May 6, 2008, Varese Sarabande released another soundtrack album featuring music composed by Giacchino from the show's third season. The soundtrack contains two discs: the first featuring selected music from the season, the second featuring the entire original score from the acclaimed season finale episodes, "Greatest Hits" and "Through the Looking Glass".