My library of several thousand tracks was a hodgepodge collection from lots of places with the album names and artists messed up. My old MP3 player didn't care but the new player chokes on the bad info. I was faced with manually updating all the track info until I found this. It fixed 90% of the tracks automatically.
Once preferences are tweaked, this can be confusing, your good to go. Actual clean up can be time consuming. This is not as automagical as touted, but has some wonderful features. Overall I am quite satisfied !
TuneUp, plug-in for iTunes, lets music fans get the most out of the music you love by offering the music management and discovery tools that you crave, all within the familiar iTunes interface. TuneUp fixes mislabeled song information (like those annoying Track 01s and Unknown Artists); fills in missing album art (no more gray music notes); alerts you to local, upcoming concerts based on the artists in your iTunes; and grants you access to YouTube videos, artist bios from Wikipedia, cool merchandise from eBay and song recommendations based on what you're listening to on iTunes. Choose from up to four album covers to apply (special editions, imports, etc) Song information and album artwork are saved directly to the file Automatic concert alerts generated around the artists in the user's music collection Instantly available enhanced web content based on what's playing in iTunes.