Here is a clip from "Dragonshy," Season 1: Episode 7 of My Little Pony: Friendship is Magic. This is when the Mane 6 prepare to take on a sleeping dragon in a mountain cave.

The music is two NFL Football Themes
1. "Round Up" by Sam Spence
2. "NFL on FOX theme" by Scott Schreer

I actually found it funny that I inserted football themes, and at 0:53, Fluttershy just happens to be wearing a Football helmet.

Vocal only tracks credit to MLPTF2Mods.com
Round up is credit to NFL Films and Sam Spence, the NFL on FOX theme is credit to Fox Sports.
MLP: FiM is credit to Lauren Faust and Hasbro Studios.

Disclaimer: I own nothing here.
No Copyright Infringement intended
This video is protected under Fair Use policies regarding parodies.