A pony fan who goes by EthePianoMan over on Youtube sent in two great vocal/piano covers of MLP:FiM songs.
The first is The Failure Song, which finally aired this morning. You can watch it in the video. The other is Smile, Smile, Smile, and you can find it here. EthePianoMan is a very talented guy, so these covers are well done. Make sure to give them a listen!
Thanks to EthePianoMan!