How replace a some values in fields with anothe one in all tags?

[ohrenkino]

Have a look at this thread to see how many different ways there are to get multiple values into one (type of) field:

Genre/Style Meta-Tagging Sources

Hi Folks, Have recently switched my workflow over to MP3TAG and have recently completed curating my audio library. I'm in the process of revisiting the "Genre/Style" meta-tag in an effort to ensure that it is a simplified as possible and adheres (albeit somewhat) to standardization. I figure I'd post some links - most of you probably have already - that I found in case other newcomers to the community are looking for them. I also have separate text file lists that I can upload in case someon…

You can check in MP3tag if you have real multi-value fields by opening the extended tags dialogue (Alt-T). For real multi-value fields you should see 2 entries with the same field name.

If you do not want it to be like that, you can merge these fields with an action:

Merge Duplicate Fields – Mp3tag Documentation

Also, you can check the column definition for the field where you see \\: if there is something like $metasep(genre,\\) then you see the contents of all multi-value fields.