MandoPony is a very talented brony. One of his great original songs is called With a Sister, inspired by the Sisterhooves Social episode. MandoPony did a fantastic job writing and recording that song—and you can listen to it in the video.
But if you want to play it yourself, then DCane is here to help! DCane wrote chords for With a Sister so that other fans could play along as well. Find the chords here and give them a try!