Upgrading iTunes Artwork


I want to upgrade the quality of some of the cd artwork in my iTunes library but I cannot delete the old artwork without deleting all of the music tracks as well. How do I delete the existing artwork (not the music) so I can import (click and drag) better quality artwork in.
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Gdoodle: You're right - that is a great source for artwork. I am now a regular user. Thanks.
Will not let me drop album artwork in. Just added about a hundred albums. I go and do what I did before and try to add cover art and it will not let me drop it in the info page.

Highlighting all the songs in a album
Bring up file and get info. Page pops up
Find the image in goggle images
drag over and no go.

What the heck is happening.

Used the apple to get a bunch of artwork and most is OK, will have to change some
Highlighting all the songs in a album
Bring up file and get info. Page pops up
Find the image in goggle images
drag over and no go.

What the heck is happening.

Are the CD's you've ripped to iTunes formatted as .WAV files? If so, per my response above, .WAV files will not support that method of drag-and-drop as other formats. If you want to rip in high-rez and use drag-and-drop I'm pretty sure AIFF would work. Apple Lossless certainly works.

The only way I know of to get iTunes to associate artwork to .WAV files is to have iTunes fetch the available artwork via the software. The actual .WAV files do not support metadata the same way the other formats can. iTunes does a sort of runaround of this by creating some sort of path to the artwork via the softare. Unfortunately it does not support drag-and-drop for .WAV
Well I don't know what happened in 12 hours but it works now. Perhaps it needed the rest after all the new input. Just going to rethink the way I am doing this.