Did I miss a mass tag data import feature somewhere in mp3tag?
A .csv file into a script Tag Import is what I imagine.
Have a huge database of dance recordings, started on punch cards in 1966! Now lives on a relational database.
I value the dance name, tempo and instrumentation in my database more than what is currently stored in mp3 tags. But; friends have customized similar music collections by reusing default tags. Their work vanished when some jukebox software release did them a "favor" and re-tagged every mp3 in sight. (That made them into off line backup believers!)