Read there ... at the very end of the post ...
Find more ...
https://community.mp3tag.de/search?q=add+genre
You can make the change by the action "Format value" or by the converter "Tag -Tag", for example ...
Convert | Tag - Tag | ALT+5
Select format string
Field: GENRE
Format string:
$if(%GENRE%,$meta_sep(GENRE,'\\')'\\',%DUMMY%)'Other Genre'
Preview
From:
Latin Jazz
To:
Latin Jazz\\Other Genre
There is also the most simple way using the dialog "Extended Tags...":
Select the group of files, open the dialog "Extended Tags...", add a new tag-field GENRE and fill in the proper genre value.
DD.20120611.1154.CEST
Edit.DD.20120611.1245.CEST