I disagree with flocksoftâ€™s
opinion, but I do think his issue warrents some thought.
I think the decision was correct to populate the â€œAlbum Artistâ€ column in the ML with the value from the â€œArtistâ€ tag, when the â€œAlbum Artistâ€ tag is NULL.
By taking this approach, all of ones MP3s need only be tagged with â€œArtistâ€ information in order for the â€œAlbum Artistâ€ field to be useful. Thus songs with a tagged value for â€œAlbum Artistâ€ can be used, compared, and filtered right along with those that have no value for "Album Artist".
However, I would like to have a way to view which files have a value in the â€œAlbum Artistâ€ field. Currently I am not aware of a means to achieve this.
A Smart View with a query of: albumartist != ""
will return all the files that have been re-scanned in the ML, regardless of whether the file is tagged with a value for â€œAlbum Artistâ€ or the ML auto-populated one with the value from the â€œArtistâ€ field.