For everypony who believes that Cadance is best princess! Even if she's second place for the fandom saying she's best princess, she doesn't get a lot of love (mostly cuz she's married to somepony is a little lame) In my opinion, this song is Cadance's, literally:

Not just 'cause it celebrates our favorite canon couple, but it's my favorite MLP song IN GENERAL!
WE LOVE YOU CADANCE, NEVER FORGET THAT!