Audioshell

This freeware tool is called Audioshell & is one of the best tools I've found. It helps you tag your music files more thoroughly, with the ability to add art and change all aspect of the files' tag. Not only that but when you've installed it you'll notice right away that when you hover your mouse pointer over an mp3 file, Audioshell shows you MUCH more information than you'd see not having it. Enjoy!!