This is a song about Sunset Shimmer waiting for Twilight to return.

Lyrics:

Everything's so strange
The way we walk and we talk, talk, talk it out

And you're just playing games
Maybe Twilight's something to forget

I have watched the skies
And I have wished at sunset

I wrote a letter everyday
In the book that you left since you've gone away

It may be that you need some time,
I hope we won't be left behind