This piece of music is taken straight from Fire Emblem: Awakening for the Nintendo 3DS, in which it plays on the game's final battle. The song was shortened for Smash, as it was originally longer.
Original Composers (Fire Emblem: Awakening): Hiroki Morishita and Rei Kondoh
Note: Super Smash Bros. as a whole uses music from various sources, be it arranged or pulled straight from the original games. Nintendo is copyright holder of the series overall, while I don't own anything.
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![](https://i.ytimg.com/vi/eYHyS2SpzQM/maxresdefault.jpg)