My apologies to Mozart.

"MLP:FIM" is the property of Hasbro.
"The Shawshank Redemption" is the property of Columbia Pictures and Warner Bros.
The actual song was "Canzonetta sull'aria", part of "The Marriage of Figaro", by Mozart.

So, apparently I'm not the first guy to think of something like this, heavylikeashadow beat me to it. By a few months.