I am looking for a way to clear the genre tag of all my music files (approx. 20.000 files).
I have done my share of Googling etc., but somehow cannot find the right way to do it.

Relevant info:
- Formats: mostly mp3, ogg, flac
- Platform: Linux (Debian/Xubuntu)
- I am looking for a batch / scripted solution
- I would like to preserve the timestamp of the files
- The genre can remain empty after cleaning

I use Kid3-qt and Easytag for regular tagging and Kid3 has CLI support, but I cannot get it working for this purpose.

Any suggestions and/or example scripts?