Hi! I saw that video here on your tumblr that was about a reason to become a nun and it was focused on the fashion. It was only about 30 seconds long. Anyway, there was a song playing towards the end and I was wondering if you knew what it was! It sounds like a hymn of some sort.
I honestly have no idea. :( Maybe you could ask the person who made it/posted it on youtube. Sorry I can’t help you out!