Thanks for your post. You were right: iTunes does not alter mp3 tag information.
I did locate the malware that
was altering my tag information: (Too bad I paid for it)
Netgear Media Server that came with the MP101 Digital Music Player (inconsistantly) changes the Artist Name and Album Name tags to suit its needs. I suppose since the display on the music player is only 16 characters wide, it makes sense to display the artist and title info as "Who,The". What makes no sense at all is to change the tags in the file to this format also.
Once the Artist and Album tags changed, the iTunes 'keep library organized' function was moving files all over.
It seems that Netgear Media Server and iTunes were fighting over library organization: NMS would change "The Beatles" to "Beatles,The" (without a space after the comma!), and remember that its path is iTunes Music/The Beetles. iTunes would move the song to iTunes Music/Beetles,The. NMS would not be able to find the file at the path it expected. On a subsequent scan for media, NMS would locate the file iTunes had moved, and update its database entry. So now iTunes and NMS are happy, unfortunately, I think The Beetles should be called "The Beatles", not "Beatles,The"; "The Who" sould not be "Who,The" and "The Dark Side of the Moon" should not be "Dark Side of the Moon,The".
Things got really confused when I tried changing Artist and Album tags from iTunes. With 'keep library organized' on, when I changed a tag, iTunes would move the file. NMS would notice this change and put the tag back. Later iTunes would move the file, with the altered tag back.
Also WinXP "Read-Only" file attribute is completely ignored by NMS.
I filed service request re. this problem at Netgear but I do not expect a software engineer to parachute into my back yard with a fix in the next 20 minutes.
PC Windows XP iTunes 6.0.4.2