BLUECAT  Good solution to correcting lots of meta data

If you have songs with missing or incorrect meta data on your Macintosh, Jaikoz is well worth your time and money. There is no other program available on the Mac that provides all the capabilities of Jaikoz.

If some of your meta data is correct, you can easily transfer the correct portions to other songs that have problems. The color coding scheme showing what data has changed is very useful, and allows you to easily verify the updates before you save them to your hard disk.

Jaikoz integrates with MusicBrainz, giving you a chance to capture a lot of meta data starting with just the music, by matching up the song and grabbing the meta data from MusicBrainz.

Jaikoz can grab album artwork and song lyrics from the Internet, for all of your music, with one command, and store the data inside your MP3 file.

Jaikoz has extensive documentation explaining each of the features available, and suggesting sequences of operations to perform for best results.

The author is extremely helpful with support, and releases new versions with new features on a monthly or better basis.

The downside to this program is that it's written in Java, and does not have the good looking, fun to use interface that Mac Cocoa programs have. Although an MP3 tagger program is not something I use on a daily basis, so I'm willing to live with this.  
(Version 2.3.1)