Sorry, everypony! We have been behind on our work here at the site. I know Candy Coda is working hard to catch up on emails, and I'm getting on top of the news posts.
First up are some great resources from TheSydeGuys. He did an arrangement of Hearts Strong as Horses—you can see that in the video and check out the sheet music—as well as a cover of The Success Song (there's a .wav file and sheet music for that one, too).
Thanks for sharing, TheSydeGuys!