I don't know if my question is asked on the correct site, but I have to solve a problem that that also concerns MP3tag.
Usually, before importing new music I customize some fields with MP3tag (artist, albumartist, genre, usw.) but I noticed that, despite the customizations I made, my reader (Mediamonkey) imports last music tracks I purchased with the same properties assigned from the seller, who also uses Mediamonkey to manage his
The result is, for example, that if originally the ARTIST field contained a string like "Juan Maglio Pacho with Carlos Vivan" this string is imported into Mediamonkey as it is, even though I had customized with MP3tag the ARTIST field with "Juan Maglio Pacho" and the ALBUMARTIST field with "Carlos Vivan".
If tracks contain Album info then as Album must have Album Artist it is Auto filled by MM on Tag edit and you can put VARIOUS ARTIST as value for compilation Albums (I personally prefer that) so that when you browse Albums in MM they are grouped correctly.