This is my telling of Celestia's and Luna's story, from working together to the eventual conflict and it's end. Strings and violin for Celestia, Woodwinds and brass for Luna. I leave the rest to your interpretation.

Used:
LMMS
The Free HQ Orchestra Soundfonts
Audacity
Inkscape for the background
OpenShot for the video

Download:
http://www.mediafire.com/download/ww5d6k1b9abdeed/How+sisters+break.mp3

And have a nice everything :D