When I entered the FGO VR Commemoration Quest, I noticed immediately that it had music I'd never heard before, so I decided to record it and put it up on Youtube in case it hadn't been done so before. Most likely these are soundtracks that can probably be found in the VR game itself.
Thanks for watching!
I stream sometimes, follow so that you can hang out for some FGO and chill if ya like:
Fanfiction Profile: https://www.fanfiction.net/u/3863164/Hieda-no-Akyuu