I was making this when I realized... I have only heard the original Katy Pery version one time at work, and I started humming along because of ponies. Then a co-worker heard me and gave me a weird look.
I tried to layer the spike lyrics behind the Pinkie ones in this, but it just sounds like I'm randomly growling words like cutie mark in the background.
MP3:http://www.mediafire.com/?u06vog6b9g336gb