A few things to note about this video: The melody and harmony are actually on the same octave, I just separated them for clarity. While the audio consists of whatever I used in GarageBand to make this sound as similar as possible to the original, I've only displayed what you need on-screen if you're trying to learn this soundtrack on piano. This is probably one of the easiest tracks to learn, actually.
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Soundtrack credits to the Legends of Equestria audio department, which is constantly evolving such that quoting their individual names is pretty much obsolete.
Software used: MuseScore, GarageBand, Synthesia, QuickTime, iMovie
Garageband instrument used: Classical Acoustic Guitar (Melody/Harmony), Steinway Grand Piano (Melody), Delicate Bells (Harmony)