I can't believe no one's requested this yet!
It starts at 55:45
I can't find the original or an isolated video, so if there's either, well, I can't find it.
QuoteHere's a pony, there's a pony
And another little pony
Fuzzy pony, funny pony
Pony, pony, Spike
Pony, pony, Twilight pony
Pinkie, Rainbow, Angel pony
Rarity the fashion pony
Pony, pony, Spike
Ponies in the water
Ponies in the sky
Magic pony promises
Will stick things in your eye
Ponies dancing everywhere, singing about cake!
Even Twilight cannot make a cutie mark that's fake
If no one wants to do it, it'll probably take me all of 20 minutes to make it.