Though this image is subject to copyright, I feel its use is covered by the U.S. fair use laws because:
Image source: http://ecx.images-amazon.com/images/I/511kkdSYZsL.jpg
- it is a low resolution copy of an album cover;
- it does not limit the copyright owner's rights to sell the album in any way;
- copies could not be used to make illegal copies of the album artwork on another album.