Probably one of my favourite pieces I've ever made. It sounds like The Prophecy at first, but then becomes much more epic. #18 on the soundtrack.

Enjoy!

Links:
Download: https://www.dropbox.com/s/phkqaxz4fsa8c9y/The_Flight_of_the_Alicorn_Soundtrack.zip?m
Flight of the Alicorn: http://www.fimfiction.net/story/6007/the-flight-of-the-alicorn
Artwork: http://ultimiant.deviantart.com/art/Rarity-Steampunk-wallpaper-290018548