I'm not affiliated with this company at all.
Now that thats out of the way, I've spent the past 5 days editing ID3 tags until i'm at the point i dont want to even listen to music.
I'm restoring my audio file database in preparation for setting up a jukebox. Setting it up so that EVERYTHING is within an album of some sort. My song library at the moment is on an Ibook running OSX 10.4 and Itunes and thats what this little jem works with.
I stumbled upon this when i decided i needed to add beats per minute data to my song library. The shareware version will do any song in your library as long as the song name starts with a letter between A and J.
Their AccuBeatMix integrates almost invisibly into Itunes also. their is a little checkbox above the volume slider. Basicaly It improves the smooth transition between songs if the BPM data is available.
If you need Beats Per Minute data and are running a mac this thing is awesome although it does take awhile to run. It updates the ID3 tags of the song file itself so when you move your song files, the data stays with them.
LINK to their website.