The dedication of MLP:FiM fans never ceases to amaze me. You all are awesome!
We have another resource to share for the Season 4 song, Apples to the Core. It comes from Dogman15, who hand-wrote sheet music for the song with chords and the melody line. You can see the whole thing here, or check out page 1 and page 2 separately.
Thanks for sharing and for going to all this effort, Dogman15!