I'll say it for you: "WHAT THE HELL DID I JUST WATCH?"

Starring (In order of appearance):

PRINCESS CELESTIA as Princess Trollestia (the bestia)
STEEL WORKERS OF THE 1930s as a gray and magic-less world
THE ALL-EQUESTRIAN CRANIAL IMPACT TEAM on percussion
TWILIGHT SPARKLE as Charlie Brown's teacher
PINKIE PIE on piccolo vs PINKIE PIE on tuba
and
SCOOTALOO as a chicken

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MUSIC: New Flash - Ren and Stimpy Production Music Volume 2
Hotcha Cornia by Spike Jones
Holiday for Strings by Spike Jones

All footage taken from My Little Pony: Friendship is Magic, which is owned by Hasbro and the Hub, and is a creation of Lauren Faust.

I don't own any of this stuff. I just make silly pony videos for the internet under fair use.