I'm trying to sort all my music ID3 tags in preparation for the arrival of my iPod. I've put my whole music collection thru ieatbrainz and it's found alot of ID3 tags but i have a few questions.

1. Does ieatbrainz alter the ID3 tags on the actual tracks or does it just alter the iTunes playlists.

2. What progs are available for writing the ID3s on the tracks not found ny ieatbrainz.