Well ... I want to do is to search a specific tag files that are similar but not the same, for example:
file1: Artist = "Charly García" (with accent)
file2: Artist = "Charly Garcia" (without accent)
file3: Artist = "Charli Garcia"
This I want to do in order to get consistency in my library. Not if you can because I can do to filter comparisons between two or more files. Anyway let the question.
There are users of Mp3tag, who export some tag-fields per filename to a text file, then run an external spell checking application against the text file, afterwards import the checked data into the tags of the related files.