If you like playing piano, and you like smiling (and who doesn't?), then this is the post for you! Piranhaplant, who has shared music with Everypony Sings in the past, sent in a solo piano version of Smile Smile Smile. As always, he's done a beautiful job.
Find the piano sheet music here. You can also find Piranhaplant's other pieces on the music pages. Keep singing, keep playing, and keep smiling, everypony!