So there have been a ton of PMVs using This is Halloween after the Halloween episode.  So I picked an equally appropriate lesser known gem from the same movie.  It seems to really fit the theme of the episode Luna Eclipsed from Season 2 of G4 My Little Pony.

"Poor Jack" by Danny Elfman from Nightmare Before Christmas.

My Little Pony Friendship is Magic is owned by HASBRO, Inc and Lauren Faust.