here is a couple of examples of programs which use it, and how they found the error described in the post.The first is the Edit>Details screen of MusicBrainz Picard.Next we have Ex Falso.Exaile, which also uses the Mutagen backend, also displayed the Album Artist tag correctly.I am not sure why Ex Falso labelled the tag as Performer rather than Album Artist, but I think it is an issue with the