If you have an iTunes library that's missing a few beats (you know, like artist info, track names, and album cover art), then you must head over to TuneUp, because it will add all the info for you.
For a limited, free membership, you can have TuneUp whip 100 songs and 50 album covers into proper shape. But if your library is pretty expansive, you can do a yearly or lifetime membership for $20 or $30 and let TuneUp analyze and enter your music's data for life. But that's not all that TuneUp does.
Besides filling in the blanks, TuneUp also gives you concert alerts and reminders based on your music library, so you never miss a show by one of your favorite artists. And guess what? Alerts come free.