First draft done.
Even though this song and Dance Magic were missing from the movie, I'm holding out that they might've made it to the DVD.
The Bluray/DVD have the same runtime than the TV release, so except as a bonus, I don't think it will be there.
I hope there will be a bonus or something indeed; we'd be missing a video if not (as well as some context, I guess). I wonder if these two songs were cut from the movie due to constraints?
I could imagine Dance Magic playing during Pinkie's party, and this one during the end credits. Especially with this song, I don't get it. They had to have credits anyway, though they seemed much faster-paced than in either EQG or RR.
Very late response but it might be useful.
Official instrumental extracted from Equestria Girls app:
https://drive.google.com/file/d/0Bzm3Adpq_8DBVS10RzU3YndBNlk/view
MP3 160kbps, mono. This quality is in app so I can't do anything about it.