The music of the video game Final Fantasy XIII was composed by Masashi Hamauzu. Former regular series composer Nobuo Uematsu did not contribute any pieces to the soundtrack. Music from the game has been released in several albums. The main soundtrack album, Final Fantasy XIII Original Soundtrack, was released on four Compact Discs in 2010 by Square Enix, the developers and producers of the game. Selections from the soundtrack have been released on two gramophone record albums, W/F: Music from Final Fantasy XIII and W/F: Music from Final Fantasy XIII Gentle Reveries, both in 2010 by Square Enix. An album of arranged pieces from the soundtrack, Final Fantasy XIII Original Soundtrack -PLUS-, was also released by Square Enix in 2010, as was an album of piano arrangements, Piano Collection Final Fantasy XIII. The theme song for the Japanese version of the game, "Kimi ga Iru Kara" (君がいるから, "Because You're Here"), was released as a single by For Life Music in 2009.
The soundtrack received good reviews from critics, who felt that it was Hamauzu's best work to date and an excellent mix of material and genres which took the series' music in a new direction. The "Plus" album received weaker reviews, primarily due to its perceived lack of tracks that were significantly different from those in the original soundtrack album, while "Kimi ga Iru Kara" was considered bland and disappointing. The "Piano" album's reception was split between critics who felt that the tracks did not deviate enough from the original pieces and those who felt that the straightforward arrangements were sophisticated. Music from the game was played at a live orchestral concert in Stockholm, Sweden, and was added to the permanent rotation of the international Distant Worlds concert series, while tracks from the piano album have been played in concerts in Japan and Paris.