full version: https://www.youtube.com/watch?v=FMUnRbfh46A


lyrics:

Rock, you are a rock.
Gray, you are gray.
Like a rock, which you are.
Rock.
Gray, you are gray.
Like a rock, which you are.
Rock.
This next one is about rocks.

My Little Pony: Friendship is Magic
season 4 episode 18 "Maud Pie"
by Lauren Faust, Hasbro and Hub Network