Ballroom e Youkoso Episode 14 & 19 OST question?
I was searching for this for a while, looked through the OST, Disc 1,2: Youtube The soundtrack was released on the sixth of December 2017.

BallroomEYoukoso subreddit user "BeKley", said:


  "It’s part of the Ballroom e Youkoso OST which hasn’t been released yet unfortunately.
  However, someone has made really accurate covers of these OSTs and they’ve also done the song you’ve been looking for: https://youtu.be/rXBjv-6pcIo"


I've come to the same conclusion as him, another user in the post "ImDasman" also agreed.
This was 5 months ago, it may have been released since but I doubt it.