Winter Wrap-Up. It explains how the winter wrap-up works, what everyone does, and shows Twilight's conflict. And it has nothing to do with the fact that it helped convince me to watch the show.
My ultimate प्रिय song from My Little Pony: Friendship is Magic would have to be At the Gala because the Mane Six express the dreams that they yearn for to come true in The Best Night Ever. My सेकंड प्रिय is Becoming लोकप्रिय (The Type of टट्टू Everypony Should Know). Rarity sings very well in that song. And I प्यार गाना it!
Winter लपेटें Up, mostly because it is so easy to remember and sing all the time. I like to sing Giggle at the Ghosties to myself before I go to बिस्तर though, just to remind myself that I shouldn't be scared of anything.
All of them! Hehe. I have to say At The Gala. Each टट्टू has a solo and they're all awesome. It's an epic song. I also प्यार Winter लपेटें Up, So Many Wonders, Becoming Popular, and so many more.