I like this. I have fond memories of Paper Mario: TYD, and I would love to see a MLP: FiM game like PM. Now. Music. Well, I'm currently learning to make music, program (C#), and Animate. For the music, you can probably look up some of the music types on YouTube.
I have a few songs that you can look up. (Yes, allot of these wouldn't fit in the game. Inspiration, my dear Watson.(List in spoiler))