@QuanarX  
SUNSET FAV TOO! NO OTHER CHARACTER IS AS AWESOME!

It also served as something of a training montage for the girls using their magic. So, actually not just filler.

Yeah, screw music! Who watches these movies for the music anyway? Except the people who do, of course!

Except again as I commented on Twilight’s song
 
‘Filler’ is better than most previous EQG music, and besides, its about god damn time Sunset got a song.
 
Yes I know about My Past is Not Today, how couldn’t I? Sunset’s my favorite character in MLP in general, not just EQG.
 
She needed to have an actual song in one of the movies.
 
And her having one verse in Acadaea or whatever it was called didn’t count.  
And since her part in Friendship Games was cut out where she was supposed to have a duet with Twilight, that doesn’t count either.

This video would have been shorter and more on point if it consisted of only one sentence “it exist”