Thanks redwing;
I'll check the tag[2] fields. I agree about the release vs re-mastering dates. Both tags are necessary.
Now, all I need to do is copy the data I already (manually) entered into the Year field into the Original Year field.
I haven't attempted to update the musicbrainz database yet, and won't try to do so until I really know what I am doing.
And to make things even more confusing, I find that while MusicBee has both Year and Original Year, another program (Tag&Rename) I use on my PC doesn't include Original Year - Just Year, and 'Release Time'. Perhaps Releae Time is the same as Original Year?
I'll have to play around with editing tags in MusicBee and see what shows up in Tag&Rename.
I would think that tagging a song would work for any software editing or reading the tags, but maybe not.
I understand that iTunes does not use the standard tagging system, but I'm only using it if I want to purchase music from Apple.