We got a very cool piano cover of Raise This Barn from a pony fan who goes by (fittingly) FimFan14.
You can listen to FimFan14 play the piano version of Raise this Barn in the video. Then you can check out a midi or play it yourself from the sheet music.
FimFan14 can be found on Youtube and DeviantArt. Many thanks to him for sharing his musical talents!