The MLP:FiM fandom—they read a comic that has Pinkie Pie singing a new song, so they compose a melody and make a recording of that song, and then they come up with great piano resources for it!
The song Laugh, Ponyacci, Laugh now has a four-hands duet version courtesy of INSYG. INSYG has shared some awesome resources with us in the past, and we're happy to be able to share this one too. If you have a piano-playing friend, then check out the sheet music and laugh together! Oh, and there's a midi version, too!