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http://www.equestriadaily.com/2016/02/hasbro-announces-my-little-pony.html

Mainstream song covers on the radio, that you should have heard at least once are blame-full for their lack of ideas and shabby commercial approach to the music. But fortunately there are some good covers to counter that. And many of them do really hit the spot and give a new twist to the original songs.

Here I propose you to share some cover versions which deserve to be mentioned.
I'll start:

Spoiler: Original

Spoiler: Cover version