I've spent 2 hours troubleshooting why none of my music had genre tag.
It was because the single `genre`, without `s` doesn't seem to cover any
good ganre tags... at least it didn't on my opus files
looking at the code:
7ecd86101e/mediafile.py (L1669-L2167)
i don't honestly know why anyone created the single `ganre` field in the
first place