This is a song cover using sampled vocals from "My little Pony - Friendship is Magic" as instruments of the song. I personally like to call this audio dubbing, or pony dubbing (ponydub -not to be confused with dubstep), since I'm sampling vocals of ponies from the show.
I never bothered finishing this with actual visuals, since this was always such a hyped song that I was afraid that it wouldn't live up to general expectations.
I actually lost most of my project files this year, due to computer failure/hard drive crash, but I still have some full audio projects saved (such as this), which I can share for listening purposes.
If you have questions, or want me to explain things, just ask in the comments and I'll try to get back to you.
Cover art by: http://www.youtube.com/user/xVoomertx
Original song: https://www.youtube.com/watch?v=9bZkp7q19f0