I was really happy last weekend that we finally got to see the Apple family-themed episode that featured Apples to the Core. I haven't laughed that hard at a MLP episode in a while.
Even better, we have some fantastic folksy resources from Jasonbres. He shared sheet music and tab for Apples to the Core for two instruments: mandolin and clawhammer banjo. There's also a recording of him playing banjo along with the song, so make sure to give that a listen.