This is from the group's IG page:
nightwish
Thank you to the Cardinal Vaughan School Children’s Choir for helping us elevate “The Day Of…” to the next level. Now you’re forever a part of the Nightwish history.

nightwish #nightwishhistory #choir #newmusic @cardinalvaughanschool
See this Instagram photo by @nightwish: https://www.instagram.com/p/C--tTDMITGI/