Turquoise Splash shared a truly excellent colt cover of Smile with Everypony Sings. The vocals, the instruments, the mixing—it all sounds great. You definitely want to give this one a listen! I especially like the whole chorus that comes in at the end.
You can watch the video to hear Turquoise Splash's recording. You can also download two versions of the cover: an mp3 and a .flac file. Add them to your pony music files!