Song Name- Harmony
Game- Tales of Symphonia
Composer- Motoi Sakuraba
Album- Tales of Symphonia, Disc 4, Track 23

I think it was played sometime before than the ending of Tales of Symphonia. I would be more specific, but I might accidently spoil something... I would transcribe it myself if I wasn't alrdy working on transcribing another piece ^^;;

PS- If you're interested in transcribing it and need the mp3, then PM me for it for something~