Final Fantasy VII Advent Children Original Soundtrack was released on September 28, 2005 containing new material created specifically for the movie, as well as arrangements of tunes from the Final Fantasy VII soundtrack. Both the original tracks and the arrangements cover a variety of musical styles, including orchestral, choral, classical piano, and rock music; Variety noted that the styles vary between "sparse piano noodlings, pop metal thrashings and cloying power ballads". The tracks were composed by Nobuo Uematsu, Keiji Kawamori, Kenichiro Fukui, and Tsuyoshi Sekito, and arranged by Fukui, Sekito, Kawamori, Shiro Hamaguchi, and Kazuhiko Toyama. The ending theme "Calling" was written and performed by former Boøwy vocalist Kyosuke Himuro. The album spans 26 tracks on two discs, covers a duration of 1:21:41. In addition to the regular release, a limited edition was produced. It contained alternate cover art displaying the Advent Children renditions of the characters Cloud Strife and Sephiroth and a booklet containing credits and lyrics.
A mini-album titled Final Fantasy VII Advent Children Complete Mini Album was released on April 10, 2009 to coincide with the release of the Final Fantasy VII Advent Children Complete version of the movie. The new release of the movie included a new ending theme, "Safe and Sound", Kyosuke Himuro and My Chemical Romance singer Gerard Way, and replaced "Water" with a new song, "Anxious Heart".