Suggestion by Lunar MLP. Even though this isn't an MLP song, it fits Celestia really well! Hope you enjoy! :D

Song Info
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Title: Cost of the Crown

Lyrics by: Mercedes Lackey

Music by: Shandeen O'Neill
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Download
https://drive.google.com/file/d/0B4rWjc5HWscnbS0tSjBtc3RCeFk/view?usp=sharing

Original Art
http://symbianl.deviantart.com/art/Celestia-s-Regret-458075287