AllMusic provides comprehensive music info including reviews and biographies. Get recommendations for new music to listen to, stream or own. http://allmusic.com/
Manage your music collection with a detailed discography on rock, electronic, hip hop, classical and other popular and obscure music genres.
SongGenie analyzes, identifies and repairs your mp3 tags and names. Get more out of iTunes and rediscover your music with SongGenie
Transform iTunes and Windows Media Player with TuneUp. Fix mislabeled song info, add album art and explore your Tuniverse. Available for Mac or PC.
Download over 400 free AppleScripts for iTunes on the Mac, plus get tips and information on writing your own iTunes AppleScripts.
Understanding iTunes’ sorting tags