The original Japanese version is included on the single "Real Emotion/1000 no Kotoba". A different English version was also done by Kumi, released on her single Come With Me. The Come With Me single also includes a remix titled: "1000 Words" (DJ 19 Remix). An orchestrated Japanese version is included on Koda Kumi's album Grow into One as a bonus track, alongside the original version.
"1000 Words" has three versions on the game's original soundtrack: the version Yuna sings on the Thunder Plains, an instrumental piano version, called "A Wish That Spans the Ages" in the Luca sphere theater, and a longer, orchestrated version, that plays during the game's ending credits.
During the Japanese concert FMV Yuna transforms into Lenne, and continues to perform the solo in Lenne's likeness. In the English version, Lenne appears alongside Yuna and they perform together.
In the HD Remaster, the Japanese version retains its original FMV and the overseas version uses the original overseas version making it the only content in the HD Remaster to not be faithful to the International version of the game.
The Thunder Plains concert is organized for the Gullwings to help pacify the conflicted Spirans whose unrest was further triggered by the disappearances of Nooj, Gippal, and Baralai, the leaders of Spira's factions. The Gullwings enlist the help of Tobli from the Moonflow to promote the concert and gather a crowd, but even as members of the Youth League and New Yevon are brought to the concert grounds tensions rise. Yuna addresses the people, telling them that even in times of conflict they need to remain united in their hearts to help the world move on.
During Yuna's performance the Songstressdressphere summons Lenne's spirit, her memories of the Zanarkand she lived in, and her final moments with Shuyin as the pair was gunned down. The pyreflies from the dressphere react with the stage's sphere display to broadcast Lenne's memories to everyone in attendance. Lenne's spirit steps out of the dressphere and performs the song together with Yuna. At the song's end the thunderstorm briefly ceases, the clouds part and the sun shines down on the barren plains. The experience drains Yuna emotionally, but understanding Lenne's true feelings gives her the resolve to find Shuyin's spirit and tell him Lenne had loved him to bring a peaceful end to the Vegnagun conflict.
"1000 Words" appears as an Event Music Sequence for Final Fantasy X-2. Triggering the Extended Version causes clips from the Normal and Good Endings of Final Fantasy X-2 to appear. The International version features the original Japanese version of the song, and there is a minor change where Yuna's change to Lenne is changed to the segment presented in the International releases where she changed in a burst of light, rather than retaining the original Japanese where Yuna smoothly changed into Lenne, making the EMS look rather strange.