[header] How to have a perfect itunes library [title] Start with your old itunes library. [step] Look and see if you have any albums missing, if so google the artist, wikipedia usually has the complete discography, and fix your albums with proper capitalization. This is key! [title] Find album artwork. 
[step] This can be challenging at first but after you get the hang of it it is easy and moves quickly, simply copy and paste the album title into google images. A wide variety should pop up, if not, keep searching.