FINAL FANTASY XIII - The Promise " FINAL FANTASY XIII - The Promise " is a prominent theme of " Final Fantasy XIII " , and is considered its main theme . It was composed by Masashi Hamauzu . Game appearances . " Final Fantasy XIII " . As the main theme , " The Promise " is heard several times . It has several arrangements and is also included in many tracks . The track itself is heard in - game at the title screen , and is the second track of the first disc . A " prototype " version of the theme is included in the " " . Arrangements of " The Promise " include " Serah ' s Theme " , the twenty - second track of the soundtrack ' s second disc , which is a vocal arrangement performed by Frances Maya used in several cutscenes involving Serah or her crystallized tear : it also replaces Eternal Love in the overseas versions . Another vocal arrangement is " Sunleth Waterscape " , which is the eponymous location ' s background theme and the sixteenth track of the second disc , and was also performed by Frances Maya . " In the Sky that Night " is another arrangement used for flashbacks of the Bodhum Fireworks Festival ( with the sole exception of Hope ' s ) , and the fourteenth track of the soundtrack ' s first disc . Another prominent arrangement of " The Promise " is " The Archylte Steppe " , the background theme for the eponymous location and the third track of the soundtrack ' s fourth disc . Finally , " Fabula Nova Crystallis " , the sixteenth track of the soundtrack ' s fourth disc , which plays during the final cutscenes before the final battle . " The Promise " ' s motif is also included in several other tracks , including " Forever Fugitives " ; " Glory ' s Fanfare " ; the background theme for the ending cutscene of the game , " Determination " . " FINAL FANTASY XIII - Miracles - " includes the motif of " The Promise " at its conclusion , and is the seventeenth track of the soundtrack ' s fourth disc . The " Ending Credits " are an extended orchestral performance of " The Promise " , and is the twenty - second track of the soundtrack ' s fourth disc . The lyrics for " Serah ' s Theme " and " The Sunleth Waterscape " were revised for the English localization of " Final Fantasy XIII " ( even though the original recordings were already in English ) because of the opinion of the English - language staff that the lyrics needed to sound more natural to native speakers . An instrumental version of " Sunleth Waterscape " has been released on the " " album . " Final Fantasy XIII - 2 " . " The Promise " can be heard in some cutscenes , and the original " Serah ' s Theme " from " Final Fantasy XIII " makes several appearances as well due to the now protagonist nature of the character , for example when in New Bodhum , Serah tells Noel Kreiss about how Snow left her and started his search for Lightning , and in the Fate and Freedom paradox ending . " The Promise " was also used in the debut trailer for the game . " Fabula Nova Crystallis " plays during the secret ending of Requiem of the Goddess downloadable content scenario . " The Archylte Steppe " acts as the background track for the Prologue in the Beginner ' s Primer and the Paddraean Archaeopolis area of Yaschas Massif 1X AF . " Sunleth Waterscape " returns as the backing track for Sunleth Waterscape 400 AF and the southern section of 300 AF . The original Japanese version are used in all localizations , and the overseas lyrics are not used at all in the game . " The Promise " briefly reappears in the tracks " Claire Farron " , " Humanity ' s Tale " , and " Credits ~ Light Eternal " . The song itself appears in a story relevant role in the side quest , " Play It for Me " . Lumina taught the song to a boy who plays part of it on his horn to attract Lighting ' s attention . He tells her to find supply spheres contain parts of the song and return them to him and he ' ll play the full song in exchange . After doing so , Lightning explains the significance of the song and its connection to herself and Snow ; it was a favorite of Serah ' s who would often hum it . The boy promises he ' ll keep playing the song in case Snow should overhear . Lightning states the title of the song is " Miracles " , though it doesn ' t match the actual song named such , instead matching " The Promise " . In " " , the 16 - bit version of the theme appears . " Dissidia 012 Final Fantasy " . " The Archylte Steppe - original - from FINAL FANTASY XIII " appears as the overworld music for Lightning , and is the fifteenth track of the second disc of the " Original Soundtrack " . " The Promise " was also included in the medley of ending themes created for " DISSIDIA 012 [ duodecim ] - ending - from DISSIDIA 012 [ duodecim ] FINAL FANTASY " , the twentieth track of the soundtrack ' s second disc . It is the last theme to play before the themes representing the two " Dissidia " titles . " Dissidia Final Fantasy " ( 2015 ) . " Sunleth Waterscape " is available from a " Theatrhythm Final Fantasy " event . " Theatrhythm Final Fantasy " . " The Promise " and " Sunleth Waterscape " appear for the " Final Fantasy XIII " Series Mode as its Opening and Field music , respectively . " Sunleth Waterscape " is also one of two themes chosen for the downloadable 3DS eShop Demo . " Archylte Steppe " is a bonus Field Music Sequence theme available as downloadable content . An arrangement of " The Sunleth Waterscape " plays as a quest medley BGM . " Theatrhythm Final Fantasy Curtain Call " . " Sunleth Waterscape " and " Archylte Steppe " reappear as Field Music Sequences for " Final Fantasy XIII " . " Final Fantasy XV " . As showcased during the event , " Sunleth Waterscape " will be one of the tracks from the series that can be played on the party ' s car while driving . Arrangement album appearances . A piano arrangement combining " FINAL FANTASY XIII - The Promise " with " Sunleth Waterscape " was included . It is the second track of this album . Compilation album appearances . " Sunleth Waterscape " was included in this " best of " type vinyl album as the third track of Side A . " W / F : Music from Final Fantasy XIII - Gentle Reveries - " . " Serah ' s Theme " was included in this " best of " type vinyl album as the third track of Side A . Live performances . An orchestral performance of " Fabula Nova Crystallis " with the lyrics of " Serah ' s Theme " , conducted by Arnie Roth , performed by the Kanagawa Philharmonic Orchestra and Frances Maya is present on the third Distant Worlds album . It was originally performed in Tokyo in November 2010 . It is the eight track of the second disc . Lyrics . A live recording of " The Promise - Blinded By Light " from at the London premiere of the on February 15 , 2014 , conducted by Arnie Roth , is included on this album .