I actually keep my music matching separate, and do it in Music Brainz Picard. I went through and fixed tags for somewhere around 10,000 tracks rather painlessly

I actually keep my music matching separate, and do it in Music Brainz Picard. I went through and fixed tags for somewhere around 10,000 tracks rather painlessly. It will also rename and move your files automatically. Since it also uses user submitted data, it does a great job of finding some pretty obscure stuff too. I highly recommend it.