Regarding using a field other than Comments: the Comments field is for user information not covered by an existing MP3 tag field. The Group field is used by Apple for classical music, and will probably be used for similar things by various software (ie. _grouping_ music together).

I'd love to access the ability to add special new tags via the MP3 (or AAC) format specs and put TuneTags data there, but then you couldn't use them in Smart Playlists in iTunes, since iTunes wouldn't know about those fields. I am considering a way to make the tag-format I used more compact, perhaps <T>Tag1<T>Tag2</T> for example, leaving off the <TuneTags... etc parts. No ideal solution - I'm trying my best to handle a situation where I don't control the programming of the application TuneTags has to work with.

I also hope to add bulk-edit and other capabilities to TuneTags, but I may wait on that until I switch to Objective-C development instead of AppleScript Studio.

Also, regarding auto-classifying - I've considered adding abilities to look at some of the online classification databases (any you think would be particularly useful?). It would be an interesting thing to do, and could make semi-automatic tagging possible. I've even considered building some kind of community-based tagging web database myself, but that would involve a lot of time (and expensive bandwidth, if it became popular). I wouldn't know how to keep it from costing me without making some kind of ads/registration/donation. Anyone have any ideas about that? Post here or send me an email by visiting my site.