The first version of this song was called "Skybridge". This version is a little less calm because I put ALL the tracks that you can hear in the game into one MP3. So, it's basically what you hear during the ending. So you have a calm version (Sky Bridge) and this version, both feel pretty different even though they are essentially the same song.
Make sure to play Aether, no single MP3 can really show the music of that game in it's full glory.